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Consequently—since 16 February Julian/1 March 1900 Gregorian and until 15 February Julian/28 February 2100 Gregorian—the Julian calendar is currently 13 days behind the Gregorian calendar.The Julian calendar has been replaced as the civil calendar by the Gregorian calendar in almost all countries which formerly used it, although it continued to be the civil calendar of some countries into the 20th century.During the changeover between calendars and for some time afterwards, dual dating was used in documents and gave the date according to both systems. The ordinary year in the previous Roman calendar consisted of 12 months, for a total of 355 days.In contemporary as well as modern texts that describe events during the period of change, it is customary to clarify to which calendar a given date refers by using an O. In addition, a 27- or 28-day intercalary month, the Mensis Intercalaris, was sometimes inserted between February and March.ancient solar calendars had used less precise periods, resulting in gradual misalignment of the calendar with the seasons.The octaeteris, a cycle of 8 lunar years popularised by Cleostratus (and also commonly attributed to Eudoxus) which was used in some early Greek calendars, notably in Athens, is 1.53 days longer than eight Julian years.The problems became particularly acute during the years of Julius Caesar's pontificate before the reform, 63–46 BC, when there were only five intercalary months (instead of eight), none of which were during the five Roman years before 46 BC.
Varro used it in 37 BC to fix calendar dates for the start of the four seasons, which would have been impossible only 8 years earlier.This intercalary month was formed by inserting 22 or 23 days after the first 23 days of February; the last five days of February, which counted down toward the start of March, became the last five days of Intercalaris.The net effect was to add 22 or 23 days to the year, forming an intercalary year of 377 or 378 days.For the Gregorian the figure is one day in 3,030 years.The difference in the average length of the year between Julian (365.25 days) and Gregorian (365.2425 days) is 0.002%.