Julian calendar
About the Julian calendar
Julius Caesar's calendar, designed mainly by the astronomer Sosigenes of Alexandria, took effect on 1 January 45 BCE. It has three years of 365 days followed by a leap year of 366, giving an average of 365.25 days, which gains about a day every 128 years against the seasons. Several Orthodox churches, including the Russian and Serbian, still use it for feasts, and it currently runs 13 days behind the Gregorian calendar.
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