The basis of the Babylonian calendar seems always to have been lunar.

For the derived name, see Tammuz (Babylonian calendar).

The Babylonian lunar-solar calendar was popular in ancient times since it adjusted the seasons while preserving the sanctity of the Moon.

The week originated in the Babylonian calendar where one day out of seven was devoted to rest.

The scientific date takes into account evidence from the ancient Babylonian calendar and its astronomical observations.

He is the regent of the 10th month in the Babylonian calendar.

This calendar was more advanced than the Babylonian calendar.

However, it is significantly different from the Babylonian lunar calendar which evolved into the 354-day Hebrew calendar as known today.

They even adopted the Babylonian lunar-solar calendar as their own.

These documents show that the Jewish community of Elephantine used the Egyptian and Babylonian calendars.