Sothic year(Chronol) the Egyptian year of 365 days and 6 hours, as distinguished from the Egyptian vague year, which contained 365 days. The Sothic period consists of 1,460 Sothic years, being equal to 1,461 vague years. One of these periods ended in July, a. d. 139.
Chambers's Twentieth Century Dictionary
Sothic yearthe ancient Egyptian fixed year, according to the heliacal rising of Sirius
Another Sothic date of the 7th year of Senwosri III.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1" by Various