I can understand about day , month and year it’s related to repetitive sunrise , moon’s phases and repetition of seasons respectively but there’s nothing I’m able to think about when is comes to week .
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Let’s start with another set of time units: hour, minute and later seconds came from the need to find smaller divisions beyond the natural time measurement (day) that help to structure your time planning. There is not much more to it than this.
Now there is also a natural time measurement which is a full circle of the phases of the moon – about 28 days, but this is a rather long period. It makes sense to split it into four parts, each 7 days long. Voilá, the week was born.
Of course, the definition of “month” has later changed and is now no longer tied to the moon, but the 7-day week has still proven to be useful, so we stick with it.
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