
30. Menstrual Cycle
Many people have referred to the menstrual cycles as “Moon cycles.” Since ancient times there has been a strong belief that the phases of the Moon synchronize with female menstruation. There are even websites and smartphone apps that can help you track your Moon cycle.
The average menstrual cycle lasts 28 days, which is almost as long as they move cycle. That means that one revolution of the Moon around the Earth is roughly equivalent to one menstrual cycle. Some small studies have been done about this phenomenon, and they suggest that a woman’s period coincides with the late phase that leads up to a Full Moon.