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Sothic year

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noun
  1. the fixed year of the ancient Egyptians, determined by the heliacal rising of Sirius, and equivalent to 365 days.
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Origin of Sothic year

First recorded in 1820–30; Soth(is) + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sothic year

Sothic year

noun
  1. the fixed year of the ancient Egyptians, 365 days 6 hours long, beginning with the appearance of the star Sirius on the eastern horizon at dawn, which heralded the yearly flooding of the Nile. A Sothic cycle contained 1460 such years
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012