• merc@sh.itjust.works
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    4 months ago

    In English common law, a “lunar month” traditionally meant exactly 28 days or four weeks, thus a contract for 12 months ran for exactly 48 weeks

    https://en.wikipedia.org/wiki/Lunar_month

    So, depending on the legal framework, a 28 day marker could be very useful. If they were actually tracking the moon, you’d think it would be 29 units even though a lunar month can vary between about 29.1 and 29.9 days. Then again, 28 notches on a stick means 29 sections, so…?

    It’s interesting that a woman’s menstrual cycles is approx 28.1 days on average, with a standard deviation of 3.95 days. That means 28 days is a lot closer to the average menstrual cycle than the average lunar month. But, the standard deviation is a lot greater.