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Records tagged “timekeeping”

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  1. Evidence-backedEditorial seedFactualenas of The Gregorian leap year rule: divisible by 4, except centuries not divisible by 400In the Gregorian calendar introduced in 1582, a year is a leap year if divisible by 4, except century years, which must be divisible by 400. So 2000 was a leap year but 1900 was not; the mean calendar year is 365.2425 days.