the fixed year of the ancient Egyptians, determined by the heliacal rising of Sirius, and equivalent to 365 days.
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British Dictionary definitions for Sothic year
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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