The Julien calendar proleptic is produced by prolonging the Calendrier Julien at the dates preceding his official introduction in 45 av. J. - C.
By using the system of Roman Numération, which does not include Zero, it is traditional to represent the years preceding 1 as “a 1 av. J. - C.”, etc In this system, 1 av. J. - C. would be a Leap year, although the leap years really used between 46 av. J. - C. and 4 were erratic (see the article on the Calendrier Julien for more details).
By using a numbering system which includes zero, it is more convenient to include a Année zero and to represent the former years as negative. It is the convention used in the astronomical Calendrier Julien. In this system year 0, equivalent with 1 av. J. - C., is one leap year.
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