Who used the first written calendars?
Man's interest in the sky is at the heart of three separate stories - astronomy, astrology and the calendar.
So, it’s not surprising that the Babylonians, who seemed to be the first great astronomers, began to use the first written calendars in the ancient cities between the Tigris and Euphrates rivers.
Clay tablets marked by cuneiform writing indicate that those Babylonian cities would have had their own calendars with their own names for the months of the year.
All cities had a month called, “Extra,” allowing them to reset the calendar in the same way as a leap year.
Each Babylonian week lasted seven days. Each seventh day was a rest day on which officials were prohibited from engaging in certain activities that couldn’t be done on the 28th day of each month, either.
Perhaps the strangest aspect - during the lunar cycle, the Babylonian month, lasting 29 or 30 days, made it so the last week of each month lasted eight or nine days.
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