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#3126 2025-09-23 06:02:37

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update
[51.4797N, 0.0000E] 09/23/2025, 13:00:36 Europe/London
Object: Mars   (open sky map)
RA 13h 54m 40.1s Dec -11° 44' 48.8" Appar J2000
Mag: 1.57 (Estimated: JPL)  Const: Virgo
Sun Dist: 232,217,148 km [23.7 km/s]
Earth Dist: 349,616,155 km [47.8 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
143.9
Sol number:   
306

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#3127 2025-09-23 08:09:18

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/11/27 Friday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 306 Business Month 11 Fifth month of Quarter 2 of Year 38
Today on Earth: 2025/09/23 Tuesday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 143.9 Sol Number: 306  Change in degrees is +.5 Julian date is: J0038306
Solar Longitude: 143.4 Sol Number: 305  Change in degrees is +.5 Julian date is: J0038305
Solar Longitude: 142.9 Sol Number: 304  Change in degrees is +.5 Julian date is: J0038304 << skipdayonmars
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   232,217,148 km [23.7 km/s] Difference is -187244 <= -7801 km/hour at 12 on 09/23 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,404,392 km [23.7 km/s] Difference is -186654 <= -7777 km/hour at 12 on 09/22 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,591,046 km [23.6 km/s] Difference is -186131 <= -7755 km/hour at 12 on 09/21 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: HIP 67870 in path Day 0 – 0 ahead
TYC 5556-460-1 above path Day 0 – 0 ahead Day 1 – 1 past and likely last 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.

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

Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

===
Earth Distance in km: 2025/09/23 349,616,000 (increasing)
Earth Distance in km: 2025/09/22 349,200,000 (increasing)
Earth Distance in km: 2025/09/21 348,777,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 306 is in Month 11 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  11 extends from Sol 280 through 307. <<== There are 28 days in Month 11. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 306 is Friday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 11 of 24: Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

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#3128 2025-09-24 06:01:41

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update

[51.4797N, 0.0000E] 09/24/2025, 13:00:00 Europe/London
Object: Mars   (open sky map)
RA 13h 57m 13.7s Dec -11° 59' 28.7" Appar J2000
Mag: 1.58 (Estimated: JPL)  Const: Virgo
Sun Dist: 232,029,565 km [23.7 km/s]
Earth Dist: 350,024,284 km [47.9 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
144.5
Sol number:   
307

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#3129 2025-09-24 10:10:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/11/278 Saturday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 307 Business Month 11 Fifth month of Quarter 2 of Year 38
Today on Earth: 2025/09/24 Wednesday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 144.5 Sol Number: 307  Change in degrees is +.6 Julian date is: J0038307
Solar Longitude: 143.9 Sol Number: 306  Change in degrees is +.5 Julian date is: J0038306
Solar Longitude: 143.4 Sol Number: 305  Change in degrees is +.5 Julian date is: J0038305
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   232,029,565 km [23.7 km/s] Difference is -187583 <= -7816 km/hour at 12 on 09/24 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,217,148 km [23.7 km/s] Difference is -187244 <= -7801 km/hour at 12 on 09/23 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,404,392 km [23.7 km/s] Difference is -186654 <= -7777 km/hour at 12 on 09/22 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 957062 below path Day 0 – 0 well ahead should should be visible on Day 1
HIP 67870 in path Day 0 – 0 ahead  Day 1 – 1 -not found
====*====*>>>

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.

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

Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

===
Earth Distance in km: 2025/09/24 350,024,000 (increasing)
Earth Distance in km: 2025/09/23 349,616,000 (increasing)
Earth Distance in km: 2025/09/22 349,200,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 307 is in Month 11 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  11 extends from Sol 280 through 307. <<== There are 28 days in Month 11. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 307 is Saturday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 11 of 24: Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

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#3130 2025-09-25 06:02:40

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:
Time was 12:00:00 UTC
Object: Mars   (open sky map)
RA 13h 59m 48.4s Dec -12° 14' 05.1" Appar J2000
Mag: 1.58 (Estimated: JPL)  Const: Virgo
Sun Dist: 231,841,418 km [23.7 km/s]
Earth Dist: 350,425,217 km [48.0 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
145
Sol number:   
308

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#3131 2025-09-25 08:39:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/01 Sunday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 308 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/09/25 Thursday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 145.0 Sol Number: 308  Change in degrees is +.5 Julian date is: J0038308
Solar Longitude: 144.5 Sol Number: 307  Change in degrees is +.6 Julian date is: J0038307
Solar Longitude: 143.9 Sol Number: 306  Change in degrees is +.5 Julian date is: J0038306
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   231,841,418 km [23.7 km/s] Difference is -188147 <= -7839 km/hour at 12 on 09/25 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,029,565 km [23.7 km/s] Difference is -187583 <= -7816 km/hour at 12 on 09/24 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,217,148 km [23.7 km/s] Difference is -187244 <= -7801 km/hour at 12 on 09/23 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 91329 well in front and just below path – Day 0 – 0 ahead
PGC 957062 below path Day 0 – 0 well ahead should should be visible on Day 1 >> just past Mars – likely last 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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/09/25 350,425,000 (increasing)
Earth Distance in km: 2025/09/24 350,024,000 (increasing)
Earth Distance in km: 2025/09/23 349,616,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 308 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 308 is Sunday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3132 2025-09-26 06:06:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:

[51.4797N, 0.0000E] 09/26/2025, 13:00:33 Europe/London
Object: Mars   (open sky map)
RA 14h 02m 23.6s Dec -12° 28' 36.9" Appar J2000
Mag: 1.59 (Estimated: JPL)  Const: Virgo
Sun Dist: 231,652,736 km [23.7 km/s]
Earth Dist: 350,818,944 km [48.1 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
145.5
Sol number:   
309

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#3133 2025-09-26 12:32:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/02 Monday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 309 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/09/26 Friday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 145.5 Sol Number: 309  Change in degrees is +.5 Julian date is: J0038309
Solar Longitude: 145.0 Sol Number: 308  Change in degrees is +.5 Julian date is: J0038308
Solar Longitude: 144.5 Sol Number: 307  Change in degrees is +.6 Julian date is: J0038307
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   231,652,736 km [23.7 km/s] Difference is -188682 <= -7862 km/hour at 12 on 09/26 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,841,418 km [23.7 km/s] Difference is -188147 <= -7839 km/hour at 12 on 09/25 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   232,029,565 km [23.7 km/s] Difference is -187583 <= -7816 km/hour at 12 on 09/24 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: TYC 5570-439-1 below path and well ahead on Day 0 - 0
PGC 91329 well in front and just below path – Day 0 – 0 ahead Day 1 – 1 past and likely last 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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/09/26 350,818,000 (increasing)
Earth Distance in km: 2025/09/25 350,425,000 (increasing)
Earth Distance in km: 2025/09/24 350,024,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 309 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 309 is Monday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3134 2025-09-27 06:06:19

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:


[51.4797N, 0.0000E] 09/27/2025, 13:00:00 Europe/London
Object: Mars   (open sky map)
RA 14h 04m 59.2s Dec -12° 43' 03.6" Appar J2000
Mag: 1.59 (Estimated: JPL)  Const: Virgo
Sun Dist: 231,463,739 km [23.8 km/s]
Earth Dist: 351,205,073 km [48.3 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
146
Sol number:   
310

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#3135 2025-09-27 09:31:38

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/03 Tuesday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 310 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/09/27 Saturday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 146.0 Sol Number: 310  Change in degrees is +.5 Julian date is: J0038310
Solar Longitude: 145.5 Sol Number: 309  Change in degrees is +.5 Julian date is: J0038309
Solar Longitude: 145.0 Sol Number: 308  Change in degrees is +.5 Julian date is: J0038308
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   231,463,739 km [23.8 km/s] Difference is -188997 <= -7875 km/hour at 12 on 09/27 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,652,736 km [23.7 km/s] Difference is -188682 <= -7862 km/hour at 12 on 09/26 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,841,418 km [23.7 km/s] Difference is -188147 <= -7839 km/hour at 12 on 09/25 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
TYC 5570-439-1 below path and well ahead on Day 0 – 0 Day 1 – 1 past and likely last day
PGC 91329 well in front and just below path – Day 0 – 0 ahead Day 1 – 1 past and likely last day – surprise... still there !!!
====*====*>>>

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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/09/27 351,205,000 (increasing)
Earth Distance in km: 2025/09/26 350,818,000 (increasing)
Earth Distance in km: 2025/09/25 350,425,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 310 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 310 is Tuesday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3136 2025-09-28 05:58:08

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update;

[51.4797N, 0.0000E] 09/28/2025, 13:00:01 Europe/London
Object: Mars   (open sky map)
RA 14h 07m 35.4s Dec -12° 57' 26.8" Appar J2000
Mag: 1.60 (Estimated: JPL)  Const: Virgo
Sun Dist: 231,274,229 km [23.8 km/s]
Earth Dist: 351,584,084 km [48.4 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
146.5
Sol number:   
311

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#3137 2025-09-28 06:38:23

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/04 Wednesday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 311 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/09/28 Sunday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 146.5 Sol Number: 311  Change in degrees is +.5 Julian date is: J0038311
Solar Longitude: 146.0 Sol Number: 310  Change in degrees is +.5 Julian date is: J0038310
Solar Longitude: 145.5 Sol Number: 309  Change in degrees is +.5 Julian date is: J0038309
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   231,274,229 km [23.8 km/s] Difference is -189510 <= -7896 km/hour at 12 on 09/28 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,463,739 km [23.8 km/s] Difference is -188997 <= -7875 km/hour at 12 on 09/27 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,652,736 km [23.7 km/s] Difference is -188682 <= -7862 km/hour at 12 on 09/26 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: HIP 69054 above path Day 0 – 0 ahead
====*====*>>>

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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/09/28 351,584,000 (increasing)
Earth Distance in km: 2025/09/27 351,205,000 (increasing)
Earth Distance in km: 2025/09/26 350,818,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 311 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 311 is Wednesday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3138 2025-09-29 06:02:13

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update

[51.4797N, 0.0000E] 09/29/2025, 13:01:01 Europe/London
Object: Mars   (open sky map)
RA 14h 10m 12.1s Dec -13° 11' 45.8" Appar J2000
Mag: 1.61 (Estimated: JPL)  Const: Virgo
Sun Dist: 231,084,162 km [23.8 km/s]
Earth Dist: 351,956,127 km [48.5 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
147
Sol number:   
312

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#3139 2025-09-29 07:48:11

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/05 Thursday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 312 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/09/29 Monday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 147.0 Sol Number: 312  Change in degrees is +.5 Julian date is: J0038312
Solar Longitude: 146.5 Sol Number: 311  Change in degrees is +.5 Julian date is: J0038311
Solar Longitude: 146.0 Sol Number: 310  Change in degrees is +.5 Julian date is: J0038310
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   231,084,162 km [23.8 km/s] Difference is -190067 <= -7919 km/hour at 12 on 09/29 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,274,229 km [23.8 km/s] Difference is -189510 <= -7896 km/hour at 12 on 09/28 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,463,739 km [23.8 km/s] Difference is -188997 <= -7875 km/hour at 12 on 09/27 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 941239 below path 10 hours ahead Day 0 – 0 ahead
HIP 69054 above path Day 0 – 0 ahead – Day 1 – 1 10 hours past
====*====*>>>

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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/09/29 351,956,000 (increasing)
Earth Distance in km: 2025/09/28 351,584,000 (increasing)
Earth Distance in km: 2025/09/27 351,205,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 312 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 312 is Thursday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3140 2025-09-30 06:04:33

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:

[51.4797N, 0.0000E] 09/30/2025, 13:00:00 Europe/London
Object: Mars   (open sky map)
RA 14h 12m 49.2s Dec -13° 25' 58.4" Appar J2000
Mag: 1.62 (Estimated: JPL)  Const: Virgo
Sun Dist: 230,893,947 km [23.8 km/s]
Earth Dist: 352,320,495 km [48.6 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
147.5
Sol number:   
313

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#3141 2025-09-30 09:42:05

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/06 Friday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 313 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/09/30 Tuesday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 147.5 Sol Number: 313  Change in degrees is +.5 Julian date is: J0038313
Solar Longitude: 147.0 Sol Number: 312  Change in degrees is +.5 Julian date is: J0038312
Solar Longitude: 146.5 Sol Number: 311  Change in degrees is +.5 Julian date is: J0038311
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   230,893,947 km [23.8 km/s] Difference is -190215 <= -7926 km/hour at 12 on 09/30 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,084,162 km [23.8 km/s] Difference is -190067 <= -7919 km/hour at 12 on 09/29 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,274,229 km [23.8 km/s] Difference is -189510 <= -7896 km/hour at 12 on 09/28 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 936853 below path Day 0 – 0 ahead
PGC 941239 below path 10 hours ahead Day 0 – 0 ahead Day 1 – 1 not found … ? 941235 ? possibly
====*====*>>>

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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/09/30 352,320,000 (increasing)
Earth Distance in km: 2025/09/29 351,956,000 (increasing)
Earth Distance in km: 2025/09/28 351,584,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 313 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 313 is Friday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3142 2025-10-01 06:02:27

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:

[51.4797N, 0.0000E] 10/01/2025, 13:00:12 Europe/London
Object: Mars   (open sky map)
RA 14h 15m 26.9s Dec -13° 40' 07.6" Appar J2000
Mag: 1.61 (Estimated: JPL)  Const: Virgo
Sun Dist: 230,703,174 km [23.8 km/s]
Earth Dist: 352,678,059 km [48.7 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
148
Sol number:   
314

936853 at far right
Next: PGC 933562 below path ahead

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#3143 2025-10-01 09:48:06

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/07 Saturday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 314 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/10/01 Wednesday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 148.0 Sol Number: 314  Change in degrees is +.5 Julian date is: J0038314
Solar Longitude: 147.5 Sol Number: 313  Change in degrees is +.5 Julian date is: J0038313
Solar Longitude: 147.0 Sol Number: 312  Change in degrees is +.5 Julian date is: J0038312
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   230,703,176 km [23.8 km/s] Difference is -190773 <= -7949 km/hour at 12 on 10/01 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,893,947 km [23.8 km/s] Difference is -190215 <= -7926 km/hour at 12 on 09/30 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   231,084,162 km [23.8 km/s] Difference is -190067 <= -7919 km/hour at 12 on 09/29 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 933562 below and ahead on Day 0 - 0
PGC 936853 below path Day 0 – 0 ahead Day 1 – 1 at far right and last moments
====*====*>>>

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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/10/01 352,678,000 (increasing)
Earth Distance in km: 2025/09/30 352,320,000 (increasing)
Earth Distance in km: 2025/09/29 351,956,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 314 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 314 is Saturday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3144 2025-10-02 06:05:11

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:


[51.4797N, 0.0000E] 10/02/2025, 13:00:00 Europe/London
Object: Mars   (open sky map)
RA 14h 18m 05.0s Dec -13° 54' 11.1" Appar J2000
Mag: 1.60 (Estimated: JPL)  Const: Virgo
Sun Dist: 230,512,069 km [23.9 km/s]
Earth Dist: 353,028,490 km [48.8 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
148.5
Sol number:   
315

Old: 933562 past near exit
New: PGC 930332 below ahead RA 14h 18m

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#3145 2025-10-02 07:53:12

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/08 Sunday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 315 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/10/02 Thursday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 148.5 Sol Number: 315  Change in degrees is +.5 Julian date is: J0038315
Solar Longitude: 148.0 Sol Number: 314  Change in degrees is +.5 Julian date is: J0038314
Solar Longitude: 147.5 Sol Number: 313  Change in degrees is +.5 Julian date is: J0038313
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   230,512,069 km [23.9 km/s] Difference is -191105 <= -7963 km/hour at 12 on 10/02 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,703,176 km [23.8 km/s] Difference is -190773 <= -7949 km/hour at 12 on 10/01 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,893,947 km [23.8 km/s] Difference is -190215 <= -7926 km/hour at 12 on 09/30 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 930332 below ahead RA 14h 18m Day 0 – 0 ahead
PGC 933562 below and ahead on Day 0 – 0 – Day 1 – 1 past near 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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/10/02 353,028,000 (increasing)
Earth Distance in km: 2025/10/01 352,678,000 (increasing)
Earth Distance in km: 2025/09/30 352,320,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 315 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 315 is Sunday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

Offline

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#3146 2025-10-03 06:01:57

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:


[51.4797N, 0.0000E] 10/03/2025, 13:00:00 Europe/London
Object: Mars   (open sky map)
RA 14h 20m 43.7s Dec -14° 08' 09.4" Appar J2000
Mag: 1.60 (Estimated: JPL)  Const: Virgo
Sun Dist: 230,320,569 km [23.9 km/s]
Earth Dist: 353,372,001 km [48.9 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
149
Sol number:   
316

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#3147 2025-10-03 08:06:26

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/09 Monday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 316 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/10/03 Friday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 149.0 Sol Number: 316  Change in degrees is +.5 Julian date is: J0038316
Solar Longitude: 148.5 Sol Number: 315  Change in degrees is +.5 Julian date is: J0038315
Solar Longitude: 148.0 Sol Number: 314  Change in degrees is +.5 Julian date is: J0038314
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   230,320,569 km [23.9 km/s] Difference is -191500 <= -7979 km/hour at 12 on 10/03 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,512,069 km [23.9 km/s] Difference is -191105 <= -7963 km/hour at 12 on 10/02 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,703,176 km [23.8 km/s] Difference is -190773 <= -7949 km/hour at 12 on 10/01 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: TYC 5574-356-1 above path RA 14h 21m Day 0 – 0 ahead
PGC 930332 below ahead RA 14h 18m Day 0 – 0 ahead Day 1 – 1 past and last 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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/10/03 353,372,000 (increasing)
Earth Distance in km: 2025/10/02 353,028,000 (increasing)
Earth Distance in km: 2025/10/01 352,678,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 316 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 316 is Monday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3148 2025-10-04 06:11:13

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update:


[51.4797N, 0.0000E] 10/04/2025, 13:00:09 Europe/London
Object: Mars   (open sky map)
RA 14h 23m 22.9s Dec -14° 22' 01.9" Appar J2000
Mag: 1.58 (Estimated: JPL)  Const: Libra
Sun Dist: 230,128,694 km [23.9 km/s]
Earth Dist: 353,708,656 km [49.1 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
149.5
Sol number:   
317

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#3149 2025-10-04 13:54:49

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

===
Today on Mars: 0038/12/10 Tuesday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 317 Business Month 12 Sixth month of Quarter 2 of Year 38
Today on Earth: 2025/10/04 Saturday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

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

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 149.5 Sol Number: 317  Change in degrees is +.5 Julian date is: J0038317
Solar Longitude: 149.0 Sol Number: 316  Change in degrees is +.5 Julian date is: J0038316
Solar Longitude: 148.5 Sol Number: 315  Change in degrees is +.5 Julian date is: J0038315
#>

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 date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://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.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   230,128,694 km [23.9 km/s] Difference is -191875 <= -7995 km/hour at 12 on 10/04 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,320,569 km [23.9 km/s] Difference is -191500 <= -7979 km/hour at 12 on 10/03 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   230,512,069 km [23.9 km/s] Difference is -191105 <= -7963 km/hour at 12 on 10/02 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some 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.
Next ahead: PGC 923238 below path RA 14h 24m Day 0 – 0 ahead
TYC 5574-356-1 above path RA 14h 21m Day 0 – 0 ahead Day 1 – 1 Past and last 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.

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

Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.

===
Earth Distance in km: 2025/10/04 353,708,000 (increasing)
Earth Distance in km: 2025/10/03 353,372,000 (increasing)
Earth Distance in km: 2025/10/02 353,028,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
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 were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 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.

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 317 is in Month 12 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  12 extends from Sol 308 through 334. <<== There are 27 days in Month 12. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 317 is Tuesday in the Proposed Business calendar for Mars.   Sol 304 was a Skip Day on Mars. Next is near 341 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
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*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

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
Copyright the Mars Society All Rights Reserved

Month 12 of 24: This is the last month of the Second Quarter. (27 Sols)

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#3150 2025-10-05 06:23:32

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 22,739

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

Place holder for today's Calendar update
[51.4797N, 0.0000E] 10/05/2025, 12:59:57 Europe/London
Object: Mars   (open sky map)
RA 14h 26m 03.1s Dec -14° 35' 49.0" Appar J2000
Mag: 1.58 (Estimated: JPL)  Const: Libra
Sun Dist: 229,936,527 km [23.9 km/s]
Earth Dist: 354,038,419 km [49.2 km/s]

Martian Year:   
38
Martian Astronomical Month:   
6
Solar longitude Ls:   
150
Sol number:   
318

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