“In the mid-1st century BCE, Julius Caesar invited astronomer Sosigenes of Alexandria to advise him about the reform of the calendar, and Sosigenes decided that the only practical step was to abandon the lunar calendar altogether. Months must be arranged on a seasonal basis, and a tropical (solar) year used, as in the Egyptian calendar, but with its length taken as 365 ¹/₄ days.”  Encyclopedia Britannica, “The Julian Calendar,” para. 1.  Britannica.com/science/calendar/The-western-calendar-and-calendar-reforms.

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