Since the early days when the Babylonians began to invent the calendar. Based primarily on the moon for 12 months was defined as 1 year, and to achieve a balance between the calendar year with the seasonal year. We've added a month for 1 month to 13 months in every four years later, the Egyptians, Greek and Semitic c. Have led to modify the calendar of the Babylonians. Until the reign of King Julius Caesar introduced the idea of an Egyptian astronomer named a new Beziers to provide a 365-day year, one in every 4 years for 29 days is called a leap day of February in the year. Prof. Equinox in March 2125 dates back to occur on March 11 instead of March 21. So Pope Gregory the 13th, so adjusted as of October 15, a new calendar called. Arion Gregorian calendar adopted January 1 as the beginning of the year.
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