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Is it just a coincidence that the the length of the entire menstrual cycle from one flow to the other lasts almost exactly as one lunar month?

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  • $\begingroup$ Do you mean if there is any correlation between day and night (specifically light as a zeitgeber) on menstrual cycle? Yes. There is. $\endgroup$ – user 33690 Aug 6 '18 at 17:13

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