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#3951 2026-10-21 08:06:46
- Mars_B4_Moon
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Re: Martian Calender - I have created a martian calender...
World's Timekeepers Vote to Eliminate the Leap Second
https://science.slashdot.org/story/26/1 … d#comments
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 20 to 24)
Prediction Generated (Earth UTC): 2026-10-21 12:02:05 UTC
Sol 20 began at 19:11:06 UTC on October 20, 2026
Earth Date October 20 spans Sols 19 and 20--- Sol 20 of 668 ---
Mars Date: MY39 / Month 1 / Day 20
Constellation: Orion
Sol Classification: Friday
Airy-0 Sol Start (Earth UTC): 2026-10-20 19:11:06 UTC
Airy-0 Sol End (Earth UTC): 2026-10-21 19:50:41 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 19.5% (2026-10-20) / 80.5% (2026-10-21)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
10
Sol number:
20
a new page so I will quote the previous page in case it is needed for updates
Last edited by Mars_B4_Moon (2026-10-21 08:07:51)
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#3952 2026-10-21 08:25:43
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
This topic is about a new calendar for Mars. That said, the time of day on Earth is shown, so the post by Mars_B4_Moon is relevant.
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#3953 2026-10-22 06:05:53
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 21 to 25)
Prediction Generated (Earth UTC): 2026-10-22 12:01:01 UTC
Sol 21 began at 19:50:41 UTC on October 21, 2026
Earth Date October 21 spans Sols 20 and 21
--- Sol 21 of 668 ---
Mars Date: MY39 / Month 1 / Day 21
Constellation: Orion
Sol Classification: Saturday
Airy-0 Sol Start (Earth UTC): 2026-10-21 19:50:41 UTC
Airy-0 Sol End (Earth UTC): 2026-10-22 20:30:17 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 16.8% (2026-10-21) / 83.2% (2026-10-22)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
10.5
Sol number:
21
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#3954 2026-10-22 06:06:40
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
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#3955 2026-10-23 06:28:42
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 22 to 26)
Prediction Generated (Earth UTC): 2026-10-23 12:00:16 UTC
Sol 22 began at 20:30:17 UTC on October 22, 2026
Earth Date October 22 spans Sols 21 and 22
--- Sol 22 of 668 ---
Mars Date: MY39 / Month 1 / Day 22
Constellation: Orion
Sol Classification: Sunday
Airy-0 Sol Start (Earth UTC): 2026-10-22 20:30:17 UTC
Airy-0 Sol End (Earth UTC): 2026-10-23 21:09:52 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 14.2% (2026-10-22) / 85.8% (2026-10-23)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
11
Sol number:
22
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#3956 2026-10-23 06:29:26
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Our first "Bracket Day" is due on Sol 27. You can see the Bracket Day approaching by noting the shrinking part of the prior Earth Day.
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#3957 2026-10-24 06:04:22
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 23 to 27)
Prediction Generated (Earth UTC): 2026-10-24 12:02:41 UTC
Sol 23 began at 21:09:52 UTC on October 23, 2026
Earth Date October 23 spans Sols 22 and 23
--- Sol 23 of 668 ---
Mars Date: MY39 / Month 1 / Day 23
Constellation: Orion
Sol Classification: Monday
Airy-0 Sol Start (Earth UTC): 2026-10-23 21:09:52 UTC
Airy-0 Sol End (Earth UTC): 2026-10-24 21:49:27 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 11.5% (2026-10-23) / 88.5% (2026-10-24)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
11.5
Sol number:
23
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#3958 2026-10-24 06:05:36
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
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#3959 2026-10-25 06:05:19
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 24 to 28)
Prediction Generated (Earth UTC): 2026-10-25 12:00:00 UTC
Sol 24 began at 21:49:27 UTC on October 24, 2026
Earth Date October 24 spans Sols 23 and 24
--- Sol 24 of 668 ---
Mars Date: MY39 / Month 1 / Day 24
Constellation: Orion
Sol Classification: Tuesday
Airy-0 Sol Start (Earth UTC): 2026-10-24 21:49:27 UTC
Airy-0 Sol End (Earth UTC): 2026-10-25 22:29:02 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 8.8% (2026-10-24) / 91.2% (2026-10-25)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
11.9
Sol number:
24
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#3960 2026-10-25 06:07:12
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
We are approaching Bracket Day on Sol 27. You can see the previous day section shrinking steadily.
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#3961 2026-10-26 06:01:52
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 25 to 29)
Prediction Generated (Earth UTC): 2026-10-26 11:59:37 UTC
Sol 25 began at 22:29:02 UTC on October 25, 2026
Earth Date October 25 spans Sols 24 and 25
--- Sol 25 of 668 ---
Mars Date: MY39 / Month 1 / Day 25
Constellation: Orion
Sol Classification: Wednesday
Airy-0 Sol Start (Earth UTC): 2026-10-25 22:29:02 UTC
Airy-0 Sol End (Earth UTC): 2026-10-26 23:08:38 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 6.1% (2026-10-25) / 93.9% (2026-10-26)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
11.9
Sol number:
24
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#3962 2026-10-26 06:02:51
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
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#3963 2026-10-27 06:03:34
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 26 to 30)
Prediction Generated (Earth UTC): 2026-10-27 12:00:00 UTC
Sol 26 began at 23:08:38 UTC on October 26, 2026
Earth Date October 26 spans Sols 25 and 26
--- Sol 26 of 668 ---
Mars Date: MY39 / Month 1 / Day 26
Constellation: Orion
Sol Classification: Thursday
Airy-0 Sol Start (Earth UTC): 2026-10-26 23:08:38 UTC
Airy-0 Sol End (Earth UTC): 2026-10-27 23:48:13 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 3.5% (2026-10-26) / 96.5% (2026-10-27)
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#3964 2026-10-27 06:04:30
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Tomorrow will be the first Bracket Day for Sol 39.
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#3965 2026-10-28 06:03:52
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 27 to 31)
Prediction Generated (Earth UTC): 2026-10-28 12:00:12 UTC
Sol 27 began at 23:48:13 UTC on October 27, 2026
Earth Date October 27 spans Sols 26 and 27
--- Sol 27 of 668 ---
Mars Date: MY39 / Month 1 / Day 27
Constellation: Orion
Sol Classification: Friday
Airy-0 Sol Start (Earth UTC): 2026-10-27 23:48:13 UTC
Airy-0 Sol End (Earth UTC): 2026-10-29 00:27:48 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 0.8% (2026-10-27) / 97.3% (2026-10-28) / 1.9% (2026-10-29) [Bracket Day: 2026-10-28]
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
13.4
Sol number:
27
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#3966 2026-10-28 06:06:45
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
The image is for the first Bracket Day of Year 39.
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#3967 2026-10-29 06:18:50
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 1: Orion -- 5-Sol Rolling Forecast (Sols 28 to 32)
Prediction Generated (Earth UTC): 2026-10-29 12:00:00 UTC
Sol 28 began at 00:27:48 UTC on October 29, 2026
Earth Date October 29 spans Sols 27 and 28
--- Sol 28 of 668 ---
Mars Date: MY39 / Month 1 / Day 28
Constellation: Orion
Sol Classification: Saturday
Airy-0 Sol Start (Earth UTC): 2026-10-29 00:27:48 UTC
Airy-0 Sol End (Earth UTC): 2026-10-30 01:07:23 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 95.4% (2026-10-29) / 4.6% (2026-10-30)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
13.9
Sol number:
28 << tracking with Business Calendar for Mars
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#3968 2026-10-29 06:19:55
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
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#3969 2026-10-30 06:02:39
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 2: West Gemini -- 5-Sol Rolling Forecast (Sols 29 to 33)
Prediction Generated (Earth UTC): 2026-10-30 12:00:26 UTC
Sol 29 began at 01:07:23 UTC on October 30, 2026
Earth Date October 30 spans Sols 28 and 29
--- Sol 29 of 668 ---
Mars Date: MY39 / Month 2 / Day 1
Constellation: West Gemini
Sol Classification: Sunday
Airy-0 Sol Start (Earth UTC): 2026-10-30 01:07:23 UTC
Airy-0 Sol End (Earth UTC): 2026-10-31 01:46:59 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 92.8% (2026-10-30) / 7.2% (2026-10-31)
Martian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
14.3
Sol number:
29
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#3970 2026-10-30 06:06:18
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
There is a bug in the Python program that generates this cell.
It should be showing Month 2.
(th)
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#3971 2026-10-30 08:41:48
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
And here is the revised display for Sol 29, showing Month number as well as Year number:
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#3972 Yesterday 06:03:46
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 2: West Gemini -- 5-Sol Rolling Forecast (Sols 30 to 34)
Prediction Generated (Earth UTC): 2026-10-31 12:00:01 UTC
Sol 30 began at 01:46:59 UTC on October 31, 2026
Earth Date October 31 spans Sols 29 and 30
--- Sol 30 of 668 ---
Mars Date: MY39 / Month 2 / Day 2
Constellation: West Gemini
Sol Classification: Monday
Airy-0 Sol Start (Earth UTC): 2026-10-31 01:46:59 UTC
Airy-0 Sol End (Earth UTC): 2026-11-01 02:26:34 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 90.1% (2026-10-31) / 9.9% (2026-11-01)
We are in Month Two of Mars Year 39
artian Year:
39
Martian Astronomical Month:
1
Solar longitude Ls:
14.8
Sol number:
30
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#3973 Yesterday 06:11:06
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
We have entered Month 2 of Year 39.
Month 1 is now in the record books.
The next event is to see if Month 1 can be assembled into a Calendar Page suitable for printing.
(th)
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#3974 Today 07:17:41
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
Place holder for today's Calendar update:
python3 BusinessCalendarForMarsV08.py
Mars Year 39 -- Month 2: West Gemini -- 5-Sol Rolling Forecast (Sols 31 to 35)
Prediction Generated (Earth UTC): 2026-11-01 13:00:01 UTC << Post time is later due to time change in the US
Sol 31 began at 02:26:34 UTC on November 01, 2026
Earth Date November 01 spans Sols 30 and 31
--- Sol 31 of 668 ---
Mars Date: MY39 / Month 2 / Day 3
Constellation: West Gemini
Sol Classification: Tuesday
Airy-0 Sol Start (Earth UTC): 2026-11-01 02:26:34 UTC
Airy-0 Sol End (Earth UTC): 2026-11-02 03:06:09 UTC
Sol Duration (Mars Time): 24h 00m 00s
Sol Duration (Earth Time): 24h 39m 35.244s
Earth UTC Overlap: 87.4% (2026-11-01) / 12.6% (2026-11-02)
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#3975 Today 07:18:43
- tahanson43206
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Re: Martian Calender - I have created a martian calender...
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