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#3926 Yesterday 06:01:24

tahanson43206
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Registered: 2018-04-27
Posts: 26,184

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

Place Holder for today's Calendar update:

51.4792N, 0.0000E] 10/12/2026, 13:00:04 Europe/London
Object: Mars   [open sky map]
RA 08h 44m 00.9s Dec +19° 22' 34.7" Appar J2000
Mag: 1.06 (Estimated: JPL)  Const: Cancer


Sun Dist: 235,195,647 km [23.4 km/s] Km Mi
Earth Dist: 236,913,397 km [29.6 km/s]
Martian Year:   
39
Martian Astronomical Month:   
1
Solar longitude Ls:   
5.6
Sol number:   
12

Current ID: 242072

Total number of registered users: 19,630
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#3927 Yesterday 06:38:46

tahanson43206
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Registered: 2018-04-27
Posts: 26,184

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

python3 BusinessCalendarForMarsV07.py

Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 11 to 15)

Prediction Generated (Earth UTC): 2026-10-12 12:37:38 UTC
Sol 11 began at 13:14:49 UTC on October 11, 2026
Earth Date October 11 spans Sols 10 and 11

--- Sol 11 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 11

  • Constellation: Orion

  • Sol Classification: Wednesday

  • Airy-0 Sol Start (Earth UTC): 2026-10-11 13:14:49 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-12 13:54:24 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 43.6% (2026-10-11) / 56.4% (Next Day)

--- Sol 12 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 12

  • Constellation: Orion

  • Sol Classification: Thursday

  • Airy-0 Sol Start (Earth UTC): 2026-10-12 13:54:24 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-13 14:33:59 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 40.9% (2026-10-12) / 59.1% (Next Day)

--- Sol 13 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 13

  • Constellation: Orion

  • Sol Classification: Friday

  • Airy-0 Sol Start (Earth UTC): 2026-10-13 14:33:59 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-14 15:13:35 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 38.3% (2026-10-13) / 61.7% (Next Day)

--- Sol 14 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 14

  • Constellation: Orion

  • Sol Classification: Saturday

  • Airy-0 Sol Start (Earth UTC): 2026-10-14 15:13:35 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-15 15:53:10 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 35.6% (2026-10-14) / 64.4% (Next Day)

--- Sol 15 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 15

  • Constellation: Orion

  • Sol Classification: Sunday

  • Airy-0 Sol Start (Earth UTC): 2026-10-15 15:53:10 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-16 16:32:45 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 32.9% (2026-10-15) / 67.1% (Next Day)

Mars Business Calendar Protocol | Airy-0 Mean Midnight | MY 39

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#3928 Yesterday 09:25:12

tahanson43206
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Registered: 2018-04-27
Posts: 26,184

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

This post is reserved for a brief announcement...

ChatGPT and I are planning a physical Business Calendar for Mars.  We needed a term for the Earth Day that falls inside a Martian Sol.

We considered a number of possible terms, and finally settled on "Bracket Day"

If anyone in NewMars has an opinion or has a better suggestion, this is an opportunity to weigh in.

The new calendar is shaping up as a standard 12 inch by 12 inch page size, with the upper panel showing the constellation of the Month.

The constellation for the current month (1) is Orion.

A "Bracket" day will occur every 36+ Sols. 

There will be Martian Months without bracket days, but there will never be more than one Bracket Day in a Martian Month.

(th)

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#3929 Yesterday 11:02:23

tahanson43206
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Registered: 2018-04-27
Posts: 26,184

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

===
Today on Mars: 0039/01/12 Thursday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 011 Business Month 01 First month of Quarter 1 of Year 39  
Today on Earth: 2026/10/12 Monday
>16

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

This calendar is NOT the Darian Calendar!

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

Martian Year: 39  Martian Astronomical Interval in 12 interval format: 1 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 30 degrees

===
Solar Longitude: 005.6 Sol Number: 012  Change in degrees is +.5 Julian date is: J0039012
Solar Longitude: 005.1 Sol Number: 011  Change in degrees is +.5 Julian date is: J0039011
Solar Longitude: 004.6 Sol Number: 010  Change in degrees is +.5 Julian date is: J0039010
#7>

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 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
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)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perihelion 2026/03/26
Mars passed through 0 Radial Distance on outbound leg Sol 633 of Year 38 2026/08/25 Solar Longitude is 341.1 (90 degrees season)
Mars will pass through 0 Radial Distance on inbound leg Sol 219 at longitude 71 270 degrees seasonal)
Conversion between seasons and physical frameworks: L_s = theta + 251  theta = L_s - 251

===
Distance: Mars >> Sun per theskylive.com:   235,195,647 km [23.4 km/s] Difference is +177792 <= +7408 km/hour at 12.0 on 10/12 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com:   235,017,855 km [23.4 km/s] Difference is +178505 <= +7438 km/hour at 12.0 on 10/11 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com:   234,839,350 km [23.4 km/s] Difference is +179153 <= +7465 km/hour at 12.0 on 10/10 (time 12:00) (24.0 hours)
>13

Velocity along the orbit is NOT the same thing as velocity change of the radial distance to the Sun. Both are shown in the section above.
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 may be seen in a simulated telescope view at https://theskylive.com/mars-tracker
14>

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 14 and 15 minutes. Communications delay would be 28+ minutes round trip.

=== Time estimate will change below 234 megaKm
Earth Distance in km: 2026/10/12 236,913,397 (decreasing)
Earth Distance in km: 2026/10/11 238,012,337 (decreasing)
Earth Distance in km: 2026/10/10 239,104,924 (decreasing)
>15

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

===
Sol 012 is in Month 01 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary. <<< 37 is skip day on Mars
Month  01 extends from Sol 1 through 28. <<== There are 28 Sols in Month 01. See post 82 of Holidays topic for current details
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 012 is Thursday in the Proposed Business calendar for Mars.   Sol 667 Skip Day on Mars. Next is near 24 or 37 of Year 39
##

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 1 of 24: First month of Quarter 1 and first month of Mars Year 39

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#3930 Today 06:33:27

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 26,184

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

Place holder for today's Calendar update:

theskylive.com has changed the way it shows information about objects, so I was unable to capture the usual data about the position of Mars.

The location data is still shown, but the usual screen scrape technique no longer works.

The information collected previously is still available, in the Details pages.

These readings were taken after 14:00 UTC just to see what they would look like  ( 14:40  (Daytime))

Sample:
Mars is in the constellation of Cancer, at a distance of 235,733,098.8 kilometers from Earth. The current Right Ascension is 08h 46m 27s and the Declination is +19° 14’ 21” (apparent coordinates). The magnitude of Mars is 1.04. Check out tonight's visibility information of Mars for tonight.

Distance from Earth
The distance of Mars from Earth is currently 235,732,007.8 kilometers, equivalent to 1.5757711436 Astronomical Units. Light takes 13m 6.317s to travel from Mars and arrive to us.

Here is the daily report from our French reference:


Martian Year:   
39
Martian Month:   
1
Solar longitude Ls:   
6.1
Sol number:   
13

Current ID 242092
Total number of registered users: 19,630
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Total number of posts: 237,772
Newest registered user: Redfoot-2026
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Online: tahanson43206

This is the final installment of the daily calendar report.  We are transitioning to the visual calendar as precursor for a full one Martian Year physical calendar.

===
Today on Mars: 0039/01/13 Friday Days of the week OFFSET 4 with Earth.  (count from Mars to Earth )
Sol 013 Business Month 01 First month of Quarter 1 of Year 39  
Today on Earth: 2026/10/13 Monday
>16

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

This calendar is NOT the Darian Calendar!

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

Martian Year: 39  Martian Astronomical Interval in 12 interval format: 1 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 30 degrees

===
Solar Longitude: 006.1 Sol Number: 013  Change in degrees is +.5 Julian date is: J0039013
Solar Longitude: 005.6 Sol Number: 012  Change in degrees is +.5 Julian date is: J0039012
Solar Longitude: 005.1 Sol Number: 011  Change in degrees is +.5 Julian date is: J0039011
#7>

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 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
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)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perihelion 2026/03/26
Mars passed through 0 Radial Distance on outbound leg Sol 633 of Year 38 2026/08/25 Solar Longitude is 341.1 (90 degrees season)
Mars will pass through 0 Radial Distance on inbound leg Sol 219 at longitude 71 270 degrees seasonal)
Conversion between seasons and physical frameworks: L_s = theta + 251  theta = L_s - 251

===
Distance: Mars >> Sun per theskylive.com:   235,372,719 km [23.4 km/s] Difference is +177072 <= +7378 km/hour at 12.0 on 10/13 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com:   235,195,647 km [23.4 km/s] Difference is +177792 <= +7408 km/hour at 12.0 on 10/12 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com:   235,017,855 km [23.4 km/s] Difference is +178505 <= +7438 km/hour at 12.0 on 10/11 (time 12:00) (24.0 hours)
>13

Velocity along the orbit is NOT the same thing as velocity change of the radial distance to the Sun. Both are shown in the section above.
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 may be seen in a simulated telescope view at https://theskylive.com/mars-tracker
Theskylive.com offers a wide variety of additional information in Details https?//theskylive.com/mars-info
14>

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 14 and 15 minutes. Communications delay would be 28+ minutes round trip.

=== Time estimate will change below 234 megaKm
Earth Distance in km: 2026/10/13 235,617,076 (decreasing) << reading taken at 17:08 UTC
Earth Distance in km: 2026/10/12 236,913,397 (decreasing)
Earth Distance in km: 2026/10/11 238,012,337 (decreasing)
>15

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

===
Sol 013 is in Month 01 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary. <<< 37 is skip day on Mars
Month  01 extends from Sol 1 through 28. <<== There are 28 Sols in Month 01. See post 82 of Holidays topic for current details
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 013 is Friday in the Proposed Business calendar for Mars.   Bracket Day on Mars. Next Bracket Day is Sol 27 of Year 39
##

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

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#3931 Today 08:50:04

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 26,184

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

ChatGPT and I are edging closer and closer to having everything we need to begin generating a ** real ** physical calendar.  We are thinking about using Version 8 of the Sol prediction program as a source for a new program to generate an image of a single Sol cell. 

Here is output from Version 8:

python3 BusinessCalendarForMarsV08.py

Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 13 to 17)

Prediction Generated (Earth UTC): 2026-10-13 14:45:38 UTC
Sol 13 began at 14:33:59 UTC on October 13, 2026
Earth Date October 13 spans Sols 12 and 13

--- Sol 13 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 13

  • Constellation: Orion

  • Sol Classification: Friday

  • Airy-0 Sol Start (Earth UTC): 2026-10-13 14:33:59 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-14 15:13:35 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 38.3% (2026-10-13) / 61.7% (2026-10-14)

--- Sol 14 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 14

  • Constellation: Orion

  • Sol Classification: Saturday

  • Airy-0 Sol Start (Earth UTC): 2026-10-14 15:13:35 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-15 15:53:10 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 35.6% (2026-10-14) / 64.4% (2026-10-15)

--- Sol 15 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 15

  • Constellation: Orion

  • Sol Classification: Sunday

  • Airy-0 Sol Start (Earth UTC): 2026-10-15 15:53:10 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-16 16:32:45 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 32.9% (2026-10-15) / 67.1% (2026-10-16)

--- Sol 16 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 16

  • Constellation: Orion

  • Sol Classification: Monday

  • Airy-0 Sol Start (Earth UTC): 2026-10-16 16:32:45 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-17 17:12:20 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 30.2% (2026-10-16) / 69.8% (2026-10-17)

--- Sol 17 of 668 ---

  • Mars Date: MY39 / Month 1 / Day 17

  • Constellation: Orion

  • Sol Classification: Tuesday

  • Airy-0 Sol Start (Earth UTC): 2026-10-17 17:12:20 UTC

  • Airy-0 Sol End (Earth UTC): 2026-10-18 17:51:56 UTC

  • Sol Duration (Mars Time): 24h 00m 00s

  • Sol Duration (Earth Time): 24h 39m 35.244s

  • Earth UTC Overlap: 27.6% (2026-10-17) / 72.4% (2026-10-18)

Mars Business Calendar Protocol | Airy-0 Mean Midnight | MY 39

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#3932 Today 09:03:43

tahanson43206
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Registered: 2018-04-27
Posts: 26,184

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

In this post, ChatGPT and I show which Sols will entirely enclose an Earth Day. 

python3 BusinessCalendarForMarsV08.py  --bracket-report
Mars Year 39 Bracket Days (Earth UTC)
Sol  27 | MY39 Month  1 Day 27 | 2026-10-28
Sol  63 | MY39 Month  3 Day  7 | 2026-12-04
Sol 100 | MY39 Month  4 Day 16 | 2027-01-11
Sol 136 | MY39 Month  5 Day 24 | 2027-02-17
Sol 172 | MY39 Month  7 Day  5 | 2027-03-26
Sol 209 | MY39 Month  8 Day 14 | 2027-05-03
Sol 245 | MY39 Month  9 Day 22 | 2027-06-09
Sol 281 | MY39 Month 11 Day  2 | 2027-07-16
Sol 318 | MY39 Month 12 Day 11 | 2027-08-23
Sol 354 | MY39 Month 13 Day 20 | 2027-09-29
Sol 391 | MY39 Month 15 Day  1 | 2027-11-06
Sol 427 | MY39 Month 16 Day  9 | 2027-12-13
Sol 463 | MY39 Month 17 Day 17 | 2028-01-19
Sol 500 | MY39 Month 18 Day 26 | 2028-02-26
Sol 536 | MY39 Month 20 Day  7 | 2028-04-03
Sol 572 | MY39 Month 21 Day 15 | 2028-05-10
Sol 609 | MY39 Month 22 Day 24 | 2028-06-17
Sol 645 | MY39 Month 24 Day  4 | 2028-07-24

This projection shows that the first Bracket Day occurs On October 28th.

Bracket Days will appear at different times because the rotation of the planets is independent of the movement of the planets in orbit around the Sun.

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#3933 Today 09:29:40

tahanson43206
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Registered: 2018-04-27
Posts: 26,184

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

In this post we show a first draft of a cell for the 13th Sol of Month Orion, and the cell for the 27th Sol, which encloses an entire Earth Day.

file.php?id=152

file.php?id=153

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