Submitted by Slokkkk t3_11dm4k6 in explainlikeimfive
furrykef t1_jab9rvo wrote
Reply to comment by jowie7979 in Eli5: How did people know how long a year was in olden times? by Slokkkk
A year of 365 days plus a leap day every four years is actually the Julian calendar. The Gregorian calendar adds an extra rule: there is no leap day on years divisible by 100 unless it's also divisible by 400.
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