[ELI5] When and how did the days of the week sync up globally?

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I think people have had weeks with assigned days for thousands of years, but with travel taking as long as it does I’m sure there have been many times in history where different cultures were ‘on different days’ at the same time.

I wonder when did it come to be that Monday is the same day in China as it is in Chad? Was it forced upon the conquered in, say, Roman times? Or was it one of those more modern standatizations?

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Anonymous 0 Comments

It’s semi-modern; and the result of Christian/Muslim colonization.

While almost every culture divides time into years (one cycle of the seasons) and months (one cycle of the moon); the modern week is a Jewish thing that carried into Christianity and Islam, based on God’s decree that one day in seven be set aside for rest. Before converting to Christianity, Rome had an 8-day week; and other cultures had as few as 4 or as many as 10 days in their week.

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