Cool AH Calendars

[SuperZtar64]

What are some non- Gregorian Calendars that could come out of an AH timeline? Or what about a timeline that could have a non-gregorian calendar become world-dominant?

 

[Saphroneth]

There's always the Mayan calendar system (there were three including the famous Long Count).

Or a calendar by 'Umar al-Khayyam, who got the length of the year correct to within 17 seconds (and as such would be more accurate than our modern one).

 

[Guildencrantz]

The French Revolutionary Calendar, combined with decimal time could get reformed well enough to work

 

[Skallagrim]

The ancient Greek world had various calendars that could have come into (and stayed in) widespread use in various classical ATLs. Especially the Attic (Athenian) and the Macedonian calendar are good candidates, respectively because of the cultural influence of Athens and because of the potential of Alexander's empire lasting long enough to spread the Macedonian calendar.

 

[ramones1986]

Here's from a related thread:

In an alternate Arabia where the dominant religion is Ebionitism founded by a patriarch named Muhammad ibn Adbullah al-Hashim, a permanent fixed calendar was formed after consultations with astronomers, astrologers and the Ebionite clergy:

(Note: The names of most of the months are exactly like their OTL counterparts; the only difference is that this calendar is fixed and permanent).

1. Muharram (1 March - 30 March)
2. Safar (31 March - 30 April)
3. Khuwan (1 May - 31 May)
4. Wabsan (1 June - 30 June)
5. Jumada (1 July - 31 July)
6. Rubba (1 August - 31 August)
7. Rajab (1 September - 30 September)
8. Sha'ban (1 October - 30 October)
9. Ramadan (31 October - 30 November)
10. Shawwal (1 December - 31 December)
11. Warnah (1 January - 30 January)
12. Maymun (31 January - 28/29 February)