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CELESTIAL MECHANICS

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Sothic cycle

A 1,460-year calendric cycle used in ancient Egypt; "Sothis" was the Greek name for Sirius, whose heliacal rising determined the Egyptian's fixed year of 365 days. Because of the lack of a leap day, the calendar regressed every Sothic cycle by one year.

Related entry

• Egyptian astronomy

Related category

• CELESTIAL MECHANICS

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