Submitted by Slokkkk t3_11dm4k6 in explainlikeimfive
foolishle t1_jabqt1g wrote
Reply to comment by annomandaris in Eli5: How did people know how long a year was in olden times? by Slokkkk
The lunar month is a little over 29 days so a 13 month count is going to get out of sync with the moon phase super fast.
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