When Was The Babylonian Calendar Created. Like all other calendars, the babylonian calendar had twelve lunar months (about 354. The origin of the babylonian calendar can be traced back to the ancient mesopotamian civilization, specifically to the sumerians who were the earliest known inhabitants of the.
The babylonian calendar was lunisolar, which means that periodic leap months were required to keep the lunar and solar years in synchronization. The babylonian calendar organized a year into twelve months.