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Am J Obstet Gynecol. 1980 Aug 1;137(7):834-9.

Lunar and menstrual phase locking.

Abstract

In a selected population of 312 women, prospective menses records were maintained during the autumn of 1977. Women whose menstrual cycle duration approaches the cycle duration of the earth's moon (29.5 days) tend to ovulate in the dark phase of the lunar period. The dark phase encompasses the half-cycle of the month from last quarter, through new moon, to first quarter. Women showing irregular menses also tended to ovulate during the dark phase of the lunar period.

PMID:
7405975
[PubMed - indexed for MEDLINE]
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