Submitted by Slokkkk t3_11dm4k6 in explainlikeimfive
The_camperdave t1_jab8xmg wrote
Reply to comment by annomandaris in Eli5: How did people know how long a year was in olden times? by Slokkkk
> Just by watching the moon you can come up with 13 months of 28 day cycles, and that's 364 days.
Um... The lunar cycle is 29.3 days long.
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