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#1901 2023-07-29 06:04:55

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/14 Saturday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/07/29 Saturday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 097.0 Sol Number: 209  Change in degrees is +.5 Julian date is: J0037209
Solar Longitude: 096.5 Sol Number: 208  Change in degrees is +.4 Julian date is: J0037208
Solar Longitude: 096.1 Sol Number: 207  Change in degrees is +.5 Julian date is: J0037207
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,610,352 km [22.2 km/s] Difference is -85654 <= -3669 km/hour at 08.0 on 07/29 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,696,006 km [22.2 km/s] Difference is -84265 <= -3511 km/hour at 08.0 on 07/28 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,780,271 km [22.2 km/s] Difference is -82895 <= -3454 km/hour at 08.0 on 07/27 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Four stars and galaxy across path: TYC 847-1032-1/647-1/1196-1/1351-1/PGC 1334580 at far left on Day 0
Micro-Boomer HIP 53148 in or slightly above path – Day 0 at far left – Day 1 just past Mars – might be visible tomorrow
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/07/29 353,836,820 (increasing)
Earth Distance 2023/07/28 353,197,777 (increasing)
Earth Distance 2023/07/27 352,520,999 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 209 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 209 is Saturday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1902 2023-07-30 06:07:49

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/15 Sunday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/07/30 Sunday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 097.4 Sol Number: 210  Change in degrees is +.4 Julian date is: J0037210
Solar Longitude: 097.0 Sol Number: 209  Change in degrees is +.5 Julian date is: J0037209
Solar Longitude: 096.5 Sol Number: 208  Change in degrees is +.4 Julian date is: J0037208
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,523,370 km [22.2 km/s] Difference is -86982 <= -3624 km/hour at 08.0 on 07/30 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,610,352 km [22.2 km/s] Difference is -85654 <= -3569 km/hour at 08.0 on 07/29 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,696,006 km [22.2 km/s] Difference is -84265 <= -3511 km/hour at 08.0 on 07/28 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: two galaxies just above path: PGC 1330972 RA 10h 57m 15.2s Day 0 at far left -
TYC 847-1032-1/647-1/1196-1/1351-1/PGC 1334580 at far left on Day 0 – Day 1 Between 5.5 and 11 hours past markers
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/07/30 354,523,444 (increasing)
Earth Distance 2023/07/29 353,836,820 (increasing)
Earth Distance 2023/07/28 353,197,777 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 210 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 210 is Saturday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1903 2023-07-31 06:20:10

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/16 Monday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/07/31 Monday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 097.9 Sol Number: 211  Change in degrees is +.5 Julian date is: J0037211
Solar Longitude: 097.4 Sol Number: 210  Change in degrees is +.4 Julian date is: J0037210
Solar Longitude: 097.0 Sol Number: 209  Change in degrees is +.5 Julian date is: J0037209
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,435,015 km [22.2 km/s] Difference is -88355 <= -3681 km/hour at 08.0 on 07/31 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,523,370 km [22.2 km/s] Difference is -86982 <= -3624 km/hour at 08.0 on 07/30 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,610,352 km [22.2 km/s] Difference is -85654 <= -3569 km/hour at 08.0 on 07/29 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: two stars and a galaxy just below path PGC 1322083/TYC 261-245-1/140-1 Day 0 at far left -
PGC 1330972 RA 10h 57m 15.2s Day 0 at far left - - Day 1 above 5.5 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/07/31 355,266,117 (increasing)
Earth Distance 2023/07/30 354,523,444 (increasing)
Earth Distance 2023/07/29 353,836,820 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 211 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 211 is Sunday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1904 2023-08-01 06:08:19

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/17 Tuesday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/01 Tuesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 098.3 Sol Number: 212  Change in degrees is +.4 Julian date is: J0037212
Solar Longitude: 097.9 Sol Number: 211  Change in degrees is +.5 Julian date is: J0037211
Solar Longitude: 097.4 Sol Number: 210  Change in degrees is +.4 Julian date is: J0037210
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,345,302 km [22.3 km/s] Difference is -89713 <= -3738 km/hour at 08.0 on 08/02 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,435,015 km [22.2 km/s] Difference is -88355 <= -3681 km/hour at 08.0 on 07/31 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,523,370 km [22.2 km/s] Difference is -86982 <= -3624 km/hour at 08.0 on 07/30 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: 10 galaxies below path at at 5.5 hours marker on Day 0 -
PGC 1322083/TYC 261-245-1/140-1 Day 0 at far left – Day 1 just past 5.5 hours past marker – probably last day for this trio
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/01 355,995,360 (increasing)
Earth Distance 2023/07/31 355,266,117 (increasing)
Earth Distance 2023/07/30 354,523,444 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 212 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 212 is Tuesday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1905 2023-08-02 06:07:35

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/18 Wednesday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/02 Wednesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 098.8 Sol Number: 213  Change in degrees is +.5 Julian date is: J0037213
Solar Longitude: 098.3 Sol Number: 212  Change in degrees is +.4 Julian date is: J0037212
Solar Longitude: 097.9 Sol Number: 211  Change in degrees is +.5 Julian date is: J0037211
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,254,236 km [22.3 km/s] Difference is -91066 <= -3794 km/hour at 08.0 on 08/03 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,345,302 km [22.3 km/s] Difference is -89713 <= -3738 km/hour at 08.0 on 08/02 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,435,015 km [22.2 km/s] Difference is -88355 <= -3681 km/hour at 08.0 on 07/31 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: A bright star in the path: TYC 268-466-1 RA 11h 03m 39.6s Mg 9.06 Day 0 at far left -
10 galaxies below path at at 5.5 hours marker on Day 0 – Day 1 this group was knocking at the exit
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/02 356,549,999 (increasing)
Earth Distance 2023/08/01 355,995,360 (increasing)
Earth Distance 2023/07/31 355,266,117 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 213 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 213 is Wednesday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1906 2023-08-03 06:05:58

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/19 Thursday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/03 Thursday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 099.2 Sol Number: 214  Change in degrees is +.4 Julian date is: J0037214
Solar Longitude: 098.8 Sol Number: 213  Change in degrees is +.5 Julian date is: J0037213
Solar Longitude: 098.3 Sol Number: 212  Change in degrees is +.4 Julian date is: J0037212
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,161,746 km [22.3 km/s] Difference is -92490 <= -3853 km/hour at 08.0 on 08/03 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,254,236 km [22.3 km/s] Difference is -91066 <= -3794 km/hour at 08.0 on 08/02 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,345,302 km [22.3 km/s] Difference is -89713 <= -3738 km/hour at 08.0 on 08/01 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Arc of three stars and a pair of galaxies across path: at far left on Day 0 -
TYC 268-466-1 RA 11h 03m 39.6s Mg 9.06 Day 0 at far left - - day 1 just past the 5.5 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/03 357,215,555 (increasing)
Earth Distance 2023/08/02 356,549,999 (increasing)
Earth Distance 2023/08/01 355,995,360 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 214 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 214 is Thursday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1907 2023-08-04 07:14:55

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/20 Friday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/04 Friday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 099.6 Sol Number: 215  Change in degrees is +.4 Julian date is: J0037215
Solar Longitude: 099.2 Sol Number: 214  Change in degrees is +.4 Julian date is: J0037214
Solar Longitude: 098.8 Sol Number: 213  Change in degrees is +.5 Julian date is: J0037213
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,068,079 km [22.3 km/s] Difference is -93667 <= -3903 km/hour at 08.0 on 08/04 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,161,746 km [22.3 km/s] Difference is -92490 <= -3853 km/hour at 08.0 on 08/03 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,254,236 km [22.3 km/s] Difference is -91066 <= -3794 km/hour at 08.0 on 08/02 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Mini-Boomer HIP 54423 RA 11h 08m 13.5s ahead of 11 hour marker on Day 0 -
Arc of three stars and a pair of galaxies across path: at far left on Day 0 – Day 1 between 5.5 and 11 hour markers
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/04 357,859,444 (increasing)
Earth Distance 2023/08/03 357,215,555 (increasing)
Earth Distance 2023/08/02 356,549,999 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 215 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 215 is Friday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1908 2023-08-05 06:10:18

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/21 Saturday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/05 Saturday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 100.1 Sol Number: 216  Change in degrees is +.5 Julian date is: J0037216
Solar Longitude: 099.6 Sol Number: 215  Change in degrees is +.4 Julian date is: J0037215
Solar Longitude: 099.2 Sol Number: 214  Change in degrees is +.4 Julian date is: J0037214
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   246,972,961 km [22.3 km/s] Difference is -95118 <= -3963 km/hour at 08.0 on 08/05 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,068,079 km [22.3 km/s] Difference is -93667 <= -3903 km/hour at 08.0 on 08/04 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,161,746 km [22.3 km/s] Difference is -92490 <= -3853 km/hour at 08.0 on 08/03 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Star below path TYC 269-903-1 RA 11h 10m 34.2s At far left on Day 0
HIP 54423 RA 11h 08m 13.5s ahead of 11 hour marker on Day 0 – Day 1 between 5.5 and 11 hours past markers
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/05 358,477,777 (increasing)
Earth Distance 2023/08/04 357,859,444 (increasing)
Earth Distance 2023/08/03 357,215,555 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 216 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 216 is Saturday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1909 2023-08-06 06:11:40

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/22 Sunday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/06 Sunday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 100.5 Sol Number: 217  Change in degrees is +.4 Julian date is: J0037217
Solar Longitude: 100.1 Sol Number: 216  Change in degrees is +.5 Julian date is: J0037216
Solar Longitude: 099.6 Sol Number: 215  Change in degrees is +.4 Julian date is: J0037215
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,876,575 km [22.3 km/s] Difference is -96386 <= -4016 km/hour at 08.0 on 08/06 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,972,961 km [22.3 km/s] Difference is -95118 <= -3963 km/hour at 08.0 on 08/05 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,068,079 km [22.3 km/s] Difference is -93667 <= -3903 km/hour at 08.0 on 08/04 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up … slim pickings !!! Star above 11 hour marker TYC 269-422-1 RA 11h 12m 37.9s Day 0 -
TYC 269-903-1 RA 11h 10m 34.2s At far left on Day 0 – Day 1 below 11 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/06 359,197,333 (increasing)
Earth Distance 2023/08/05 358,477,777 (increasing)
Earth Distance 2023/08/04 357,859,444 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 217 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 217 is Sunday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1910 2023-08-07 06:26:48

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/23 Monday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/07 Monday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 101.0 Sol Number: 218  Change in degrees is +.5 Julian date is: J0037218
Solar Longitude: 100.5 Sol Number: 217  Change in degrees is +.4 Julian date is: J0037217
Solar Longitude: 100.1 Sol Number: 216  Change in degrees is +.5 Julian date is: J0037216
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,778,831 km [22.3 km/s] Difference is -97744 <= -4173 km/hour at 08.0 on 08/07 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,876,575 km [22.3 km/s] Difference is -96386 <= -4016 km/hour at 08.0 on 08/06 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   246,972,961 km [22.3 km/s] Difference is -95118 <= -3963 km/hour at 08.0 on 08/05 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Two stars and two galaxies just above path: PGC 1288166 RA 11h 15m 43.1s far left on Day 0 -
TYC 269-422-1 RA 11h 12m 37.9s Day 0 – Day 1 above 11 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/07 359,716,599 (increasing)
Earth Distance 2023/08/06 359,197,333 (increasing)
Earth Distance 2023/08/05 358,477,777 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 218 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 218 is Monday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1911 2023-08-08 06:05:01

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/24 Tuesday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/08 Tuesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 101.4 Sol Number: 219  Change in degrees is +.4 Julian date is: J0037219
Solar Longitude: 101.0 Sol Number: 218  Change in degrees is +.5 Julian date is: J0037218
Solar Longitude: 100.5 Sol Number: 217  Change in degrees is +.4 Julian date is: J0037217
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,679,761 km [22.3 km/s] Difference is -99070 <= -4128 km/hour at 08.0 on 08/08 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,778,831 km [22.3 km/s] Difference is -97744 <= -4073 km/hour at 08.0 on 08/07 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,876,575 km [22.3 km/s] Difference is -96386 <= -4016 km/hour at 08.0 on 08/06 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Row of galaxies across path PGC 1286883/1285952/1286177/1285274/1282967 at far left on Day 0
PGC 1288166 RA 11h 15m 43.1s far left on Day 0 – Day 1 above 5.5 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/08 360,405,860 (increasing)
Earth Distance 2023/08/07 359,716,599 (increasing)
Earth Distance 2023/08/06 359,197,333 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 219 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 219 is Tuesday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1912 2023-08-09 06:08:31

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/25 Wednesday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/09 Wednesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 101.9 Sol Number: 220  Change in degrees is +.5 Julian date is: J0037220
Solar Longitude: 101.4 Sol Number: 219  Change in degrees is +.4 Julian date is: J0037219
Solar Longitude: 101.0 Sol Number: 218  Change in degrees is +.5 Julian date is: J0037218
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,579,374 km [22.3 km/s] Difference is -100387 <= -4183 km/hour at 08.0 on 08/09 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,679,761 km [22.3 km/s] Difference is -099070 <= -4128 km/hour at 08.0 on 08/08 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,778,831 km [22.3 km/s] Difference is -097744 <= -4073 km/hour at 08.0 on 08/07 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Galaxy in path: PGC 1279832 RA 11h 20m 05.1s well ahead of 11 hour marker on Day 0 -
PGC 1286883/1285952/1286177/1285274/1282967 at far left on Day 0- Day 1 at 5.5 hours past marker
PGC 1288166 RA 11h 15m 43.1s far left on Day 0 – Day 1 above 5.5 hours past marker – Day 2 surprise … still visible in upper right corner
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/09 360,994,444 (increasing)
Earth Distance 2023/08/08 360,405,860 (increasing)
Earth Distance 2023/08/07 359,716,599 (increasing)
#==>

Mars and Earth are moving apart after Opposition. 
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers.
Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 220 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 220 is Wednesday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1913 2023-08-10 06:12:31

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/26 Thursday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/10 Thursday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 102.3 Sol Number: 221  Change in degrees is +.4 Julian date is: J0037221
Solar Longitude: 101.9 Sol Number: 220  Change in degrees is +.5 Julian date is: J0037220
Solar Longitude: 101.4 Sol Number: 219  Change in degrees is +.4 Julian date is: J0037219
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,477,683 km [22.3 km/s] Difference is -101691 <= -4237 km/hour at 08.0 on 08/10 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,579,374 km [22.3 km/s] Difference is -100387 <= -4183 km/hour at 08.0 on 08/09 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,679,761 km [22.3 km/s] Difference is -099070 <= -4128 km/hour at 08.0 on 08/08 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Star just above path TYC 270-1086-1 RA 11h 21m 37.9s ahead of 11 hour marker on Day 0 -
PGC 1279832 RA 11h 20m 05.1s well ahead of 11 hour marker on Day 0 – Day 1 Just past Mars
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/10 361,526,454 (increasing)
Earth Distance 2023/08/09 360,994,444 (increasing)
Earth Distance 2023/08/08 360,405,860 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 221 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 221 is Thursday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1914 2023-08-11 06:17:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/27 Friday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/11 Friday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 102.8 Sol Number: 222  Change in degrees is +.5 Julian date is: J0037222
Solar Longitude: 102.3 Sol Number: 221  Change in degrees is +.4 Julian date is: J0037221
Solar Longitude: 101.9 Sol Number: 220  Change in degrees is +.5 Julian date is: J0037220
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,374,623 km [22.3 km/s] Difference is -103060 <= -4294 km/hour at 08.0 on 08/11 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,477,683 km [22.3 km/s] Difference is -101691 <= -4237 km/hour at 08.0 on 08/10 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,579,374 km [22.3 km/s] Difference is -100387 <= -4183 km/hour at 08.0 on 08/09 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: star directly in path: TYC 267-577-1 RA 11h 23m 49.8s right at the 11 hour marker on Day 0 -
TYC 270-1086-1 RA 11h 21m 37.9s ahead of 11 hour marker on Day 0 – above 11 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a slight downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/11 362,104,238 (increasing)
Earth Distance 2023/08/10 361,526,454 (increasing)
Earth Distance 2023/08/09 360,994,444 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 222 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 222 is Friday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1915 2023-08-12 06:11:07

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/08/28 Saturday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))
One day note: Last day of Month 8 on Mars 
Today on Earth: 2023/08/12 Saturday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 103.2 Sol Number: 223  Change in degrees is +.4 Julian date is: J0037223
Solar Longitude: 102.8 Sol Number: 222  Change in degrees is +.5 Julian date is: J0037222
Solar Longitude: 102.3 Sol Number: 221  Change in degrees is +.4 Julian date is: J0037221
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,270,370 km [22.4 km/s] Difference is -104253 <= -4344 km/hour at 08.0 on 08/12 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,374,623 km [22.3 km/s] Difference is -103060 <= -4294 km/hour at 08.0 on 08/11 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,477,683 km [22.3 km/s] Difference is -101691 <= -4237 km/hour at 08.0 on 08/10 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Blotch on plate above 11 hour marker: RA 11h 26m 14.9s at center on Day 0
TYC 267-577-1 RA 11h 23m 49.8s right at the 11 hour marker on Day 0 – Day 1 just past 11 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/12 362,688,888 (increasing)
Earth Distance 2023/08/11 362,104,238 (increasing)
Earth Distance 2023/08/10 361,526,454 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 223 is in Month 08 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 196 through 223. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 223 is Saturday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 8 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1916 2023-08-13 06:10:35

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/01 Sunday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))
One day note: First day of Month 9 on Mars 
Today on Earth: 2023/08/13 Sunday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=
Resume daily update here ...
Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 103.7 Sol Number: 224  Change in degrees is +.5 Julian date is: J0037224
Solar Longitude: 103.2 Sol Number: 223  Change in degrees is +.4 Julian date is: J0037223
Solar Longitude: 102.8 Sol Number: 222  Change in degrees is +.5 Julian date is: J0037222
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,164,773 km [22.4 km/s] Difference is -105597 <= -4400 km/hour at 08.0 on 08/13 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,270,370 km [22.4 km/s] Difference is -104253 <= -4344 km/hour at 08.0 on 08/12 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,374,623 km [22.3 km/s] Difference is -103060 <= -4294 km/hour at 08.0 on 08/11 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Cluster of three galaxies just above path between 11 and 5.5 hour markers: PGC 35305 RA 11h 28m 16.5s Day 0 -
Blotch on plate above 11 hour marker: RA 11h 26m 14.9s at center on Day 0 – Day 1 above 11 hours past marker
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/13 363,246,666 (increasing)
Earth Distance 2023/08/12 362,688,888 (increasing)
Earth Distance 2023/08/11 362,104,238 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 224 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 224 is Sunday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1917 2023-08-14 06:28:44

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/02 Monday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/14 Monday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 104.1 Sol Number: 225  Change in degrees is +.4 Julian date is: J0037225
Solar Longitude: 103.7 Sol Number: 224  Change in degrees is +.5 Julian date is: J0037224
Solar Longitude: 103.2 Sol Number: 223  Change in degrees is +.4 Julian date is: J0037223
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   245,057,836 km [22.4 km/s] Difference is -106937 <= -4457 km/hour at 08.0 on 08/14 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,164,773 km [22.4 km/s] Difference is -105597 <= -4400 km/hour at 08.0 on 08/13 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,270,370 km [22.4 km/s] Difference is -104253 <= -4344 km/hour at 08.0 on 08/12 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Star in path: TYC 274-58-1 RA 11h 31m 55.5s just ahead of 11 hour marker on Day 0 -
PGC 35305 RA 11h 28m 16.5s Day 0 - - Day 1 still visible because Mars is at far left of view
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/14 364,072,222 (increasing)
Earth Distance 2023/08/13 363,246,666 (increasing)
Earth Distance 2023/08/12 362,688,888 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 225 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 225 is Monday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1918 2023-08-15 06:17:45

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/03 Tuesday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/15 Tuesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 104.6 Sol Number: 226  Change in degrees is +.5 Julian date is: J0037226
Solar Longitude: 104.1 Sol Number: 225  Change in degrees is +.4 Julian date is: J0037225
Solar Longitude: 103.7 Sol Number: 224  Change in degrees is +.5 Julian date is: J0037224
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,949,709 km [22.4 km/s] Difference is -108127 <= -4505 km/hour at 08.0 on 08/15 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,057,836 km [22.4 km/s] Difference is -106937 <= -4457 km/hour at 08.0 on 08/14 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,164,773 km [22.4 km/s] Difference is -105597 <= -4400 km/hour at 08.0 on 08/13 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Star above path TYC 274-978-1 RA 11h 32m 59.8s between 11 and 5.5 markers on Day 0
TYC 274-58-1 RA 11h 31m 55.5s just ahead of 11 hour marker on Day 0 - - Day 1 right at Mars
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/15 364,363,900 (increasing)
Earth Distance 2023/08/14 364,072,222 (increasing)
Earth Distance 2023/08/13 363,246,666 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 226 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 226 is Tuesday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1919 2023-08-16 06:05:13

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/04 Wednesday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/16 Wednesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 105.0 Sol Number: 227  Change in degrees is +.4 Julian date is: J0037227
Solar Longitude: 104.6 Sol Number: 226  Change in degrees is +.5 Julian date is: J0037226
Solar Longitude: 104.1 Sol Number: 225  Change in degrees is +.4 Julian date is: J0037225
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,840,254 km [22.4 km/s] Difference is -109455 <= -4561 km/hour at 08.0 on 08/16 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,949,709 km [22.4 km/s] Difference is -108127 <= -4505 km/hour at 08.0 on 08/15 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   245,057,836 km [22.4 km/s] Difference is -106937 <= -4457 km/hour at 08.0 on 08/14 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: four stars just ahead of Mars: TYC 274-736-1 RA 11h 34m 50.7s Day 0
TYC 274-978-1 RA 11h 32m 59.8s between 11 and 5.5 markers on Day 0 – Day 1 well past 11 hours marker – last day for 978
TYC 274-58-1 RA 11h 31m 55.5s just ahead of 11 hour marker on Day 0 - - Day 1 right at Mars  - Day 2 still visible at extreme right
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/16 364,896,444 (increasing)
Earth Distance 2023/08/15 364,363,900 (increasing)
Earth Distance 2023/08/14 364,072,222 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 227 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 227 is Wednesday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1920 2023-08-17 06:05:26

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/05 Thursday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/17 Thursday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 105.5 Sol Number: 228  Change in degrees is +.5 Julian date is: J0037228
Solar Longitude: 105.0 Sol Number: 227  Change in degrees is +.4 Julian date is: J0037227
Solar Longitude: 104.6 Sol Number: 226  Change in degrees is +.5 Julian date is: J0037226
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,729,526 km [22.4 km/s] Difference is -110728 <= -4614 km/hour at 08.0 on 08/17 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,840,254 km [22.4 km/s] Difference is -109455 <= -4561 km/hour at 08.0 on 08/16 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,949,709 km [22.4 km/s] Difference is -108127 <= -4505 km/hour at 08.0 on 08/15 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Galaxy above path and just inside 11 hour marker PGC 1249917 RA 11h 37m 37.9s Day 0 -
TYC 274-736-1 RA 11h 34m 50.7s Day 0 – Day 1 still visible at far upper right of view
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/17 365,422,444 (increasing)
Earth Distance 2023/08/16 364,896,444 (increasing)
Earth Distance 2023/08/15 364,363,900 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 228 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 228 is Thursday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1921 2023-08-18 06:05:21

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/06 Friday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/18 Friday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 105.9 Sol Number: 229  Change in degrees is +.4 Julian date is: J0037229
Solar Longitude: 105.5 Sol Number: 228  Change in degrees is +.5 Julian date is: J0037228
Solar Longitude: 105.0 Sol Number: 227  Change in degrees is +.4 Julian date is: J0037227
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,617,522 km [22.4 km/s] Difference is -112004 <= -4667 km/hour at 08.0 on 08/18 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,729,526 km [22.4 km/s] Difference is -110728 <= -4614 km/hour at 08.0 on 08/17 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,840,254 km [22.4 km/s] Difference is -109455 <= -4561 km/hour at 08.0 on 08/16 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Star and galaxy across path: TYC 275-17-1 above and PGC 1238129 below RA 11h 41m 15.4s at far left on Day 0 -
PGC 1249917 RA 11h 37m 37.9s Day 0 - - Day 1 still visible at upper right
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/18 366,006,000 (increasing)
Earth Distance 2023/08/17 365,422,444 (increasing)
Earth Distance 2023/08/16 364,896,444 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 229 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 229 is Friday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1922 2023-08-19 06:07:31

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/07 Saturday <<-- Days of the week offset 0 with Earth.  (count from Mars to Earth (updated 2023/07/14))

Today on Earth: 2023/08/19 Saturday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 106.4 Sol Number: 230  Change in degrees is +.5 Julian date is: J0037230
Solar Longitude: 105.9 Sol Number: 229  Change in degrees is +.4 Julian date is: J0037229
Solar Longitude: 105.5 Sol Number: 228  Change in degrees is +.5 Julian date is: J0037228
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,504,271 km [22.4 km/s] Difference is -113251 <= -4719 km/hour at 08.0 on 08/19 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,617,522 km [22.4 km/s] Difference is -112004 <= -4667 km/hour at 08.0 on 08/18 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,729,526 km [22.4 km/s] Difference is -110728 <= -4614 km/hour at 08.0 on 08/17 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Stars across path ahead of 11 hour marker: TYC 275-97-1 and TYC 275-104-1 RA 11h 42m 27.3s Day 0
TYC 275-17-1 above and PGC 1238129 below RA 11h 41m 15.4s at far left on Day 0 – Day 1 just ahead of Mars – might be good for one more day
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/19 366,455,555 (increasing)
Earth Distance 2023/08/18 366,006,000 (increasing)
Earth Distance 2023/08/17 365,422,444 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 230 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 230 is Saturday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1923 2023-08-20 06:07:38

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/07 Saturday <<-- Days of the week offset 1 with Earth.  (count from Mars to Earth (updated 2023/08/20))
One day note: Skip day on Mars August 20 on Earth – Next skip day is September 26 on Earth
Today on Earth: 2023/08/20 Sunday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 106.9 Sol Number: 230  Change in degrees is +.5 Julian date is: J0037230 << Skip day on Mars
Solar Longitude: 106.4 Sol Number: 230  Change in degrees is +.5 Julian date is: J0037230
Solar Longitude: 105.9 Sol Number: 229  Change in degrees is +.4 Julian date is: J0037229
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,389,739 km [22.4 km/s] Difference is -114532 <= -4772 km/hour at 08.0 on 08/20 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,504,271 km [22.4 km/s] Difference is -113251 <= -4719 km/hour at 08.0 on 08/19 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,617,522 km [22.4 km/s] Difference is -112004 <= -4667 km/hour at 08.0 on 08/18 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Galaxy above path at 5.5 hours marker PGC 1232290 RA 11h 44m 20.9s Day 0 -
TYC 275-97-1 and TYC 275-104-1 RA 11h 42m 27.3s Day 0 – Day right at 11 hours past marker
TYC 275-17-1 above and PGC 1238129 below RA 11h 41m 15.4s at far left on Day 0 – Day 1 just ahead of Mars – Day 2 still visible at far upper right
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

===
Earth Distance 2023/08/20 366,980,000 (increasing)
Earth Distance 2023/08/19 366,455,555 (increasing)
Earth Distance 2023/08/18 366,006,000 (increasing)
#==>

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216, 3:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 230 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 230 is Saturday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1924 2023-08-21 06:05:49

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/08 Sunday <<-- Days of the week offset 1 with Earth.  (count from Mars to Earth (updated 2023/08/20))

Today on Earth: 2023/08/21 Monday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 107.3 Sol Number: 231  Change in degrees is +.4 Julian date is: J0037231
Solar Longitude: 106.9 Sol Number: 230  Change in degrees is +.5 Julian date is: J0037230 << Skip day on Mars
Solar Longitude: 106.4 Sol Number: 230  Change in degrees is +.5 Julian date is: J0037230
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,273,991 km [22.5 km/s] Difference is -115748 <= -4823 km/hour at 08.0 on 08/21 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,389,739 km [22.4 km/s] Difference is -114532 <= -4772 km/hour at 08.0 on 08/20 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,504,271 km [22.4 km/s] Difference is -113251 <= -4719 km/hour at 08.0 on 08/19 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Galaxy above path and above 11 hour marker: PGC 1220612 RA 11h 47m 07.3s Day 0 -
PGC 1232290 RA 11h 44m 20.9s Day 0 – Day 1: in upper right corner of view
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

===
Earth Distance 2023/08/21 367,487,777 (increasing)
Earth Distance 2023/08/20 366,980,000 (increasing)
Earth Distance 2023/08/19 366,455,555 (increasing)
#>

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 231 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 231 is Sunday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

Offline

#1925 2023-08-22 06:06:01

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 17,012

Re: Martian Calender - I have created a martian calender...

===
Today on Mars: 0037/09/09 Monday <<-- Days of the week offset 1 with Earth.  (count from Mars to Earth (updated 2023/08/20))

Today on Earth: 2023/08/22 Tuesday (Earth Date) Post Title: Today on Mars   [Aphelion occurred May 30, 2023 Earth Calendar]
====*=

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 37  Martian Astronomical Month in 12 month format: 4 <<== The Astronomical month will increment when longitude reaches 120 degrees

===
Solar Longitude: 107.8 Sol Number: 232  Change in degrees is +.5 Julian date is: J0037232
Solar Longitude: 107.3 Sol Number: 231  Change in degrees is +.4 Julian date is: J0037231
Solar Longitude: 106.9 Sol Number: 230  Change in degrees is +.5 Julian date is: J0037230 << Skip day on Mars
==#

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars data J00##### (and set Search term)
Perihelion occurred at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (estimated) 2024/05/08
Perihelion occurred at Ls 253 on Sol 485  Earth Date 2020/08/03  Earlier:  2018/09/16, 2016/10/29
Aphelion occurred at--- Ls 071 on Sol 152.  Aphelion Earth Dates: Earlier: 2017/10/07, 2015/11/20
Aphelion occurred near Ls 070 on Sol 153 (per www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

===
Distance: Mars >> Sun per theskylive.com:   244,156,981 km [22.5 km/s] Difference is -117010 <= -4875 km/hour at 08.0 on 08/22 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,273,991 km [22.5 km/s] Difference is -115748 <= -4823 km/hour at 08.0 on 08/21 (time 8:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   244,389,739 km [22.4 km/s] Difference is -114532 <= -4772 km/hour at 08.0 on 08/20 (time 8:00) (24 hours)
====*===

Observation: The sky view is ** filled ** with objects and very few have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular Movement as seen from Earth. Mars is progressing from upper right to lower left in the view from Earth.
Next up: Two galaxies just below path PGC 1209728/1209509 RA 11h 49m 28.2s – ahead of 11 hour marker on Day 0 -
PGC 1220612 RA 11h 47m 07.3s Day 0 – Day 1 above 11 hour marker – last day for 612
====*====*= 

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Note: The curve of the path of Mars as seen against the background of stars is now a line heading left at a downward angle.
As of 2023/01/11, the curve of the path has returned to regular movement to the left border

Light travel time today is between 20 and 21 minutes. Communications delay would be 42+ minutes round trip.

===
Earth Distance 2023/08/22 367,949,999 (increasing)
Earth Distance 2023/08/21 367,487,777 (increasing)
Earth Distance 2023/08/20 366,980,000 (increasing)
#>

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18, 2:36, 3:54, 4:72, 5:90, 6:108, 7:126, 8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Mars and Earth are moving apart after Opposition.  Maximum Earth-Mars is estimated to be 401 kilometers (both at apogee and opposite vs Sun)
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth appear to have been as close as they will get in this cycle. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

Regular movement of Mars as seen from Earth resumed as of 2023/01/13. RA is once again increasing.
According to www.hercampus.com, Retrograde movement began October 30, 2022.
The online solar system display at the link below shows clearly how the Mars movement will occur in months ahead.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 232 is in Month 09 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  08 extends from Sol 224 through 251. See post 82 of Holidays topic for current details. <<== There are 28 days in Month 07
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 232 is Monday  in the Proposed Business calendar for Mars. 
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. <<== The current year on Mars is 37
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

The last Skip Day occurred  July 14, 2023 on Earth. A Skip Day occurs when the longer Mars Sol accumulates 24 Earth hours.
The next Skip day is expected August 20, 2023 (range 26th >> 28th) on Earth.  The week days are in alignment until end of Month 06

For those who may not be following this proposed calendar closely, there exists a "feature" I had not anticipated.
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
Refinements of the search include: Author: tahanson43206 Topic: Martian Politics and Economy (Specify Posts instead of Topics)
The most recent End-Of-Quarter change occurred:

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1       2      3      4      5      6      7
8       9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257

Month 9 of 24: - Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

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