The
Julian calendar, introduced by
Julius Caesar in 46 BC (708
AUC), was a reform of the
Roman calendar. It took effect in 45 BC (709 AUC), shortly after the Roman conquest of Egypt. 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 3,226 years. The difference in the average length of the
year between Julian (365.25 days) and Gregorian (365.2425 days) is 0.002%.