• kryptonite@lemmy.world
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    7 months ago

    Most units of time are based on nature. A day is one rotation of the Earth. A month is the moon’s orbit. A year is the Earth’s path around the sun.

    But a week? There’s no natural explanation for it.

    Well, given that a moon cycle is about 28 days long, each quarter of that is 7 days. Before we had electric lights at night, most people were very aware of the moon phase.