when did the julian calendar come into effect
Julian calendar The Julian calendar, proposed by Julius Caesar in 46 BC (708 AUC), was a reform of the Roman calendar.[1] It took effect on 1 January 45 BC (AUC 709), 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 the figure is one day in 3,030 years.[2] The difference in the average length of the year between Julian (365.25 days) and Gregorian (365.2425 days) is 0.002%.
16th century The 16th century begins with the Julian year 1501 and ends with either the Julian or the Gregorian year 1600 (depending on the reckoning used; the Gregorian calendar introduced a lapse of 10 days in October 1582).[1]