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redvillafranco t1_jab8rba wrote on February 28, 2023 at 4:22 AM

Reply to comment by Successful_Box_1007 in Eli5: How did people know how long a year was in olden times? by Slokkkk

They knew that a cycle of 365 days had passed. And this period of time was extremely consistent and repeatable. And they called that cycle a “year”. But they didn’t necessarily need to know what was causing the cycle.