Ancient Egyptian calendar
About the Ancient Egyptian calendar
The Egyptian civil calendar had three seasons, Akhet, Peret and Shemu, each of four 30-day months, plus five epagomenal days. With no leap day it slipped a quarter day a year against the seasons, wandering through the whole year in about 1460 years, the Sothic cycle. Its simplicity made it the standard reckoning of Hellenistic astronomers, and it is the ancestor of the Coptic and Ethiopian calendars.
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