ELI5: How did humans determine that a year has 12 months and 365 days, and that a day is divided into 24 hours, 60 minutes and 60 seconds? What observations and calculations led to a time system we still use today?
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ELI5: How did humans determine that a year has 12 months and 365 days, and that a day is divided into 24 hours, 60 minutes and 60 seconds? What observations and calculations led to a time system we still use today?