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The Roman calendar (on which the Gregorian calendar was based) was synchronized with a celestial event: the lunar cycle. Originally, each Roman month began on the first day of the new moon. However, it was timed according to the full moon, which fell on the ides. The reason for this is that the full moon occurs on only a single day, but a new moon can last ...


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It is not that simple. According to this page, http://www.webexhibits.org/calendars/year-history.html it has nothing to do with Gregorian calendar and was actually decided by Iulius Caesar. Later in various countries we see many various dates when the year starts. March 1 was also a very common date and was used in ancient Rome. Starting a year from some ...



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