Gregorian calendar and Julian calendar - what's the difference?
A Short History of the Modern Calendar
Reading Julian Dates b
the julian calendar
The Julian calendar, proposed by Julius Caesar in 46 BC, was a reform of the Roman calendar. It took effect on 1 January 45 BC, by edict. It was the predominant calendar in the Roman world, most of Europe, and in European settlements in the Americas and elsewhere, until it was refined and gradually replaced by the Gregorian calendar, promulgated in 1582 by Pope Gregory XIII. The Julian calendar gains against the mean tropical year at the rate of one day in 128 years. For the Gregorian calendar, the figure is one day in 3,030 years. The difference in the average length of the year between Julian and Gregorian is 0.002%, being 10.8 minutes longer.
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