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LodeMike@lemmy.today ⁨13⁩ ⁨hours⁩ ago

• BillyClark@piefed.social ⁨11⁩ ⁨hours⁩ ago

  That can’t be correct, can it?

  They would have a rotating 7 year schedule, but it’s messed up by leap years. You have the seven calendars you’re thinking of and 1-2 leap year calendars mixed into those 7 years. It would have to be somewhere between 1 in 8 and 1 in 9, wouldn’t it?

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  • CompassRed@discuss.tchncs.de ⁨4⁩ ⁨hours⁩ ago

    I think it’s more like 303/2800 chance.

    There are 97 leap days every 400 years, then the calendar repeats. So you have 303/400 chance of not having a leap year, and in those years, you get a 1/7 chance of having this calendar. Thus 303/2800.

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    • BillyClark@piefed.social ⁨2⁩ ⁨hours⁩ ago

      This is counterintuitive to me, because 303/2800 is .108, which is between 1/9 and 1/10. But 97 out of 400 is less than 1 out of 4, so it shouldn’t be able to interfere more than twice in a 7 year cycle, on average. But your math looks correct. I must be missing something.

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  • QualifiedKitten@discuss.online ⁨4⁩ ⁨hours⁩ ago

    No, since there’s only 7 different possibilities, then over a sufficiently large sample, the probabilities would all still balance out to 1 in 7.

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    • CannonFodder@lemmy.world ⁨3⁩ ⁨hours⁩ ago

      There’s 14 different possibilities because of leap years.

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• gnarles_snarkley@beehaw.org ⁨12⁩ ⁨hours⁩ ago

  the first day of the month moves forward one weekday each year except mar-dec on a leap year moves forward two weekdays

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