Men: Note what phase the moon is in when the woman in question is on her period. Women: When you are due to get your period begin to notice the phase of the moon. Pay special attention to the phase on the first day of your period.
In approximately 28 days the moon will be entering the same phase and the menstrual cycle will be in sync for the first couple of months.
Because biological processes are non-linear this means that there will be a variation in the menstrual cycle by days or in some cases a week or more. This will gradually throw the cycle into a new lunar phase.
Note: There are a couple of benefits to having a lunar based calendar. Perhaps one of the most curious artifacts is that a particular phase of the moon may match up with a woman’s menstrual cycle. This is because the lunar cycle is 28 days and a woman’s cycle is approximately the same length.
Again, you should note that every woman is different and may not menstruate as regularly as other women.
Although the Moon’s orbit has played a dramatic role in the evolution of life and mating cycles of many animals at current there is no data to indicated a cause and effect relationship between the phases of the Moon and the menstruation of a woman. This article should simply be seen as a way to use the Moon as a natural time keeper.