Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

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