![]() ![]() A 1957 analysis of 9,551 births in Danville, Pennsylvania, found no correlation between birth rate and the phase of the Moon. Multiple studies have found no connection between birth rate and lunar phases. However, no connection between lunar rhythms and menstrual onset has been conclusively shown to exist, and the similarity in length between the two cycles is most likely coincidental. It is widely believed that the Moon has a relationship with fertility due to the corresponding human menstrual cycle, which averages 28 days. See also: Menstruation § Effects of the moon ![]() Contexts Ĭlaims of a lunar connection have appeared in the following contexts: It is used as a model for studying the biological mechanisms of marine lunar cycles. It contains a protein with light-absorbing flavin structures that differentially detect moonlight and sunlight. Another marine animal, the bristle worm Platynereis dumerilii, spawns a few days after a full moon. In Dipsastraea speciosa, a period of darkness between sunset and moonrise appears to be a trigger for synchronized spawning. Coral species such as Dipsastraea speciosa tend to synchronize spawning in the evening or night, around the last quarter moon of the lunar cycle. Corals contain light-sensitive cryptochromes, proteins that are sensitive to different levels of light. Observed effects relating to reproductive synchrony may depend on external cues relating to the presence or amount of moonlight. In a number of marine animals, there is stronger evidence for the effects of lunar cycles. The widespread and persistent beliefs about the influence of the moon may depend on illusory correlation – the perception of an association that does not in fact exist. ![]() In cases such as the approximately monthly cycle of menstruation in humans (but not other mammals), the coincidence in timing reflects no known lunar influence. Literature reviews and metanalyses have found no correlation between the lunar cycle and human biology or behavior. By the late 1980s, there were at least 40 published studies on the purported lunar-lunacy connection, and at least 20 published studies on the purported lunar-birthrate connection. A considerable number of studies have examined the effect on humans. The lunar effect is a purported correlation between specific stages of the roughly 29.5-day lunar cycle and behavior and physiological changes in living beings on Earth, including humans. Biologists as well as artists and poets have long thought about the Moon's influence on living creatures. ![]()
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