Babylonian Calendar 2025. The babylonian calendar originated in babylonia (southern iraq) in the early second millennium b.c.e., spread to the rest of mesopotamia in the late second millennium. The jewish calendar is built on the babylonian calendar, which the jews learned to appreciate during the babylonian captivity.

On asarah b’tevet, the 10th day of the jewish month of tevet, in the year 3336 from creation (425 bce), the armies of the babylonian emperor nebuchadnezzar laid siege. By dividing the year into months, weeks, and days, the babylonians established a structured and practical method for tracking time.