Abstract and Keywords
This article describes observational and theoretical calendars in ancient Mesopotamia. Some of the earliest cuneiform sources attest to calendar systems for the reckoning of days for administrative and cultic purposes. There were hemerologies which set out good and bad fortune days throughout the year and astronomical almanacs which contain the length of each month calculated for a coming year. This article suggests that Mesopotamian calendars extended into two other areas of astronomy that provide information on solstices, equinoxes, and the planets.
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