How do ancient people calculate time period of one day one year one month?
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In ancient times, years themselves could be demarcated by seasons and positions of stars in the night sky.
A month lines up pretty closely to the phases of the moon. There's almost 30 days between each full moon. The lengths of each month were tweaked so that they fit nicely into a yearly calendar.
The number of hours in a day is arbitrary. It's a system we made up to subdivide the days. So we "know" that a day is 24 hours long because we defined the hour to be 1/24th of a day.
A month lines up pretty closely to the phases of the moon. There's almost 30 days between each full moon. The lengths of each month were tweaked so that they fit nicely into a yearly calendar.
The number of hours in a day is arbitrary. It's a system we made up to subdivide the days. So we "know" that a day is 24 hours long because we defined the hour to be 1/24th of a day.
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