Submitted by Slokkkk t3_11dm4k6 in explainlikeimfive
jaa101 t1_jab6ayb wrote
Reply to comment by annomandaris in Eli5: How did people know how long a year was in olden times? by Slokkkk
> the lunar schedule of 13 months of 28 days which is 364 days
Except that synodic months actually last 30 days, not 28, and there are nearer 12 of them per year than 13.
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