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Gregorian Calendar

The Gregorian Calendar is the civil calendar that is most internationally known and used today. The Gregorian Calendar consists of 365 days divided into 12 months, with an additional day added generally every 4 years (leap year).   The Gregorian Calendar is solar based and originated as a reform to the Julian Calendar by compensating for the few minutes shorter every year that was accumulating and calculated to about 3 days every 4 centuries. The reform removed the leap year in the years that are divisible by 100 (but not 400). 

Calendar Image
Gregorian Calendar Reform