how and when did the whole world end up using a seven day week when there are multiple calendars? It’s not an obvious number…?
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My reading on the subject is that a few cultures did weeks of different lengths but that a ton of cultures did 7 day weeks because there are 7 heavenly bodies that move in a pattern different from stars – the 5 visible planets plus moon and sun.
‘the world’ went to 7 day weeks due to western influence, but most were already doing that
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