When Did The Gregorian Calendar Begin. The gregorian calendar was decreed valid by pope gregory xiii on 24 february 1582, but was not accepted by any european nations until october of that year. Pope gregory xiii began the modern calendar 400 years ago in order to correct the accumulating drift in the julian calendar and keep easter in the spring


When Did The Gregorian Calendar Begin

The gregorian calendar is a modification of the earlier julian calendar, which as the name suggests was proposed by roman dictator julius caesar. The julian calendar was a complicated lunar calendar that was put.

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