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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The Hebrew and Muslim calendars both use a seven-day week because they’re related. The Roman calendar picked up a seven-day week after they converted to Christianity, because Christians go to church on the day after the Jewish Sabbath.
Our modern calendar is mostly Roman. Almost everyone uses this calendar now, or at least has to do business with people who use it. So now there’s a standard worldwide week.
It wasn’t always this way. The Chinese calendar, for example, sometimes used a seven day week, but mostly used shorter or longer weeks. Pagan Rome used an eight day week. The Maya calendar had no week.
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