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annomandaris t1_jaapsi0 wrote

Reply to comment by cavalier78 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. that would be a good enough calendar for much of human history.

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The_camperdave t1_jab8xmg wrote

> 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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