caarmen
commented
8 years ago English:
Short: Equinox: Leap years vary so that 1 Vendémiaire always falls on the autumn equinox Romme: Like the Gregorian calendar: Leap years are years divisible by four, but not by 100 (except by 400). von Mädler: Leap years are years divisible by four, but not by 128.
https://en.wikipedia.org/wiki/French_Republican_Calendar Equinox: The leap years would continue to vary in order to ensure that each year the autumnal equinox in Paris falls on 1 Vendémiaire, as was the case from year I to year XIV. This is the only method that was ever in legal effect, although it means that sometimes five years pass between leap years, such as the years 15 and 20.[15] Romme: Leap years would have fallen on each year divisible by four (thus in 20, 24, 28…), except most century years, according to Romme's proposed fixed rules. This would have simplified conversions between the Republican and Gregorian calendars since the Republican leap day would usually follow a few months after 29 February, at the end of each year divisible by four, so that the date of the Republican New Year remains the same (22 September) in the Gregorian calendar for the entire third century of the Republican Era (AD 1992–2091). 128-Year: Beginning with year 20, years divisible by four would be leap years, except for years divisible by 128. Note that this rule was first proposed by von Mädler, and not until the late 19th century. The date of the Republican New Year remains the same (23 September) in the Gregorian calendar every year from 129 to 256 (AD 1920–2047).
Add a small text with a link to wikipedia to describe each of the calculation methods (equinox, romme, von madler)