I am writing on the 23rd day of the 11th month of the 2,017th year since a guy that only a 3rd of the world say that they believe in was born, but really don’t you think that maybe that was a pretty important event since it is pretty much how we measure our time.
Adherent estimates in 2012
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But there are other important events for those religions, and they may have a calendar based on that event. Or events.
The Islamic, Muslim, or Hijri calendar (Arabic: التقويم الهجري at-taqwīm al-hijrī) is a lunar calendar consisting of 12 months in a year of 354 or 355 days. It is used (often alongside the Gregorian calendar) to date events in many Muslim countries. … The current Islamic year is 1439 AH.
Hindu calendar is a collective term for the various lunisolar calendars traditionally used in Hinduism. They adopt a similar underlying concept for timekeeping, but differ in their relative emphasis to moon cycle or the sun cycle and the names of months and when they consider the New Year to start. Of the various regional …
Anyway. Calendars do seem more regional than drawn along religious lines
But I guess when they were set for that region it was based on the predominant religion at that time
And if you take the predominant religion
Plus that area’s Secular/Nonreligious/Agnostic/Atheist population
Because they will probably go along with whatever works for that area
Or what works best for them to the point of not having an impact on others
So the combined amount is the majority for that region