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The lunar cycle has long been suspected to influence biological phenomena.Folklore alludes to such a relationship, but previous scientific analyses havefailed to find significant associations. It has been shown that lunar cyclesindeed have effects on animals; significant associations between humancircadian rhythms and lunar cycles have also been reported. We set out todetermine whether a significant statistical correlation exists between thelunar phase and sex determination during conception. We found that significantassociations (\textit{p}-value $< 5 \times 10^{-5}$) exist between the averagesex ratio (male:female) and the lunar month. The likelihood of conception of amale is at its highest point five days after the full moon, whereas the highestlikelihood of female conception occurs nineteen days after the full moon.Furthermore, we found that the strength of this influence is correlated withthe amount of solar radiation (which is proportional to moonlight). Our resultssuggest that sex determination may be influenced by the moon cycle, whichsuggests the possibility of lunar influence on other biological phenomena. Wesuggest for future research the exploration of similar effects in otherphenomena involving humans and other species.

The lunar cycle's influence on sex determination at conception in humans