The blog “Ladyplanet. Natürlich Frau sein” is quite certain: “Our cycle is linked to that of the moon. The most obvious connection is the length of the two cycles,” it says. The newspaper Berliner Tagesspiegel comes to the opposite conclusion: “The length of women’s menstrual cycles is an average value; for some it lasts longer, for others it is shorter. Even one and the same woman can have cycles of different lengths. If they really were connected to the lunar cycle, all women would have their fertile days at the same time,” the paper’s knowledge section reads.