[triangleman]

Month = "Moonth"

Aside from the female menstrual cycle, the gestational cycle is also in line with the moon: A baby is brought to term in 10 moons or 280 days (9 months or so).

You would also have an easy way for disparate peoples to mark time, since in the past there was no such thing as telegraphs or even pony express.

[xorcist]

That's only because we have a weird method for calculating pregnancies, for historical reasons.

A human pregnancy is around 266 days +- 16. The reason for 280 days or 9 months is because that measures the time span since the last menstruation, not since conception.

(I was personally a bit surprised by this when expecting our first child. It's one of those things you apparently know about but still use "9 months" as a bit of a fixed expression.)

[cbd1984]

> Aside from the female menstrual cycle

Birth control pills have a big effect on this now.

> A baby is brought to term in 10 moons or 280 days (9 months or so).

If you can't tell how far along a pregnancy is without reference to the Moon, there's no help for you.