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Why does a year consist of 365 days and a day of 24 hours?

User Sheina
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because it takes 365 for earth to go one revolution around the sun, and 24 hours for earth to spin fully on its axis
User Shelvacu
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A year, 365 days, is the time it takes for the Earth to travel around the Sun. A day, 24 hours, is the time it takes for the Earth to spin around once on its axis.