Both the Egyptian and Sumerian calendar of 360 days was based on a lunar calendar.

Name: Both the Egyptian and Sumerian calendar of 360 days was based on a lunar calendar.
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The Egyptian calendar was originally based on a lunar system, but it evolved into a primarily solar calendar with 365 days, while the Sumerian (and later Babylonian) calendar was indeed a lunar calendar, but both civilizations adjusted their calendars to more closely align with the solar year.

Both the Egyptian and Sumerian Calendar of 360 Days Was