One study found that people aged 14-18 were more likely to menstruate around the first and third lunar quarters, regardless of cycle length. The authors of these studies suggested that people with cycle lengths that were not 29.5 days would have their period start date occur randomly during the lunar cycle. Three studies found that people with menstrual cycles of 29.5 days tend to menstruate between the first quarter and last quarter of the lunar cycle. Moon and menstruation studies 1937-2013: a summary We found eight studies published between 19 looking at any relationship between the menstrual and lunar cycles, though there were some studies done prior to 1937. Other studies have been conducted on the relationship between the lunar cycle and menstrual cycle, though not all of them were trying to answer the same question as Clue. ![]() Wheeler for Clue is the largest analysis ever done looking at the relationship between menstrual cycle and lunar phase, but it’s not the first. The lunar and menstrual cycles will correlate more or less for some people, depending how closely their average cycle length matches the lunar cycle, and the variability of their cycle length.Įxisting research about lunar cycles and menstrual cycles This may contribute to creating a false impression that the period does or should start on schedule with the moon for everyone. Menstrual cycle length can vary by age and racial-ethnic background though (1), so this may not even occur among all groups of people. So we would expect about half of all people to have their period during any random half of the lunar cycle. This makes sense, ☓ days from either the full or new moon equals about 14 days of the lunar cycle (the new moon + 6 days, and the full moon + 6 days), which is about half of the lunar cycle. Statistically speaking, assuming that periods start at random times, about 1 in 2 people will have their period start ☓ days from either the full or new moon. The global average menstrual cycle length is 29 days and the lunar cycle lasts 29.5 days (though it’s normal to have menstrual cycle lengths between 24 and 38 days). For their 7.5 million cycles, she found no indication that the period predominantly starts during the new moon, a relationship that is often suggested between lunar and menstrual cycles. Wheeler looked at period start dates for 1.5 million users of Clue who had not tracked the use of any form of hormonal birth control. “Looking at the data, we saw that period start dates fall randomly throughout the month, regardless of the lunar phase.” Wheeler is a Data Scientist at Clue who also has a PhD in Astrophysics from the University of Oxford and spent three years as a postdoctoral researcher at the Leibniz Institute for Astrophysics in Potsdam, Germany. “What you normally hear is that you ovulate around the full moon and get your period around the new moon,” said. Our data science team analyzed 7.5 million cycles and found no correlation between the lunar phases and the menstrual cycle or period start date. Clue’s research into moon phases and menstruation Does the menstrual cycle synchronize with the lunar cycle? Not according to an analysis of over 7.5 million cycles. We are often asked to add lunar cycles into Clue, so we ran the numbers to check it out, scientifically. ![]() The terms “menstruation” and “menses” come from Latin and Greek words meaning month (mensis) and moon (mene). The lunar cycle and the average menstrual cycle are basically equal in length. ![]() The lunar and menstrual cycles will correlate more or less for some people-depending how closely their average cycle length matches the lunar cycle, and the variability of their cycle length. The menstrual cycle does not sync with the lunar cycle, according to our analysis of over 7.5 million cycles.
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