An alternate calendar system briefly used by republican France. It had 360 days per year with 5 or 6 "intercalary" or leap days between years. It had 12 months of 30 days, which were comprised by 3 weeks of 10 days. Every day of the year had a unique name: a common plant, animal, mineral, or tool/equipment (ie January 31 was "Broccoli" and May 4 was "Silkworm").

YSK because it's an interesting alternative to the Gregorian calendar and the occasionally-proposed 13 month calendar.

Though it did have some problems such as starting in late September (very unusual for a calendar) and not having a robust leap-year system.

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[–] 7 points 1 year ago

13! is definitely not a prime number, but it's too large to be useful in this context (I know, I know, you didn't actually MEAN 13-factorial, but I've studied enough maths that I couldn't help it).

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