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To: Lonesome in Massachussets; BenLurkin

The synodic month (which is the familiar one) is 29.53, the sidereal month is 27.something. :^)


17 posted on 12/18/2020 11:20:06 AM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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To: SunkenCiv

The period of the moon’s “elliptical” orbit is the anomalistic month, which is different, also. The anomalistic month determines the moon’s variation in angular diameter over the course of a month. The moon’s orbit changes shape, or eccentricity and the perigee moves slightly. I am not sure what 26.5 represents.

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

Month type Length in days (in year 2000)
draconitic 27.212220815
tropical 27.321582252
sidereal 27.321661554
anomalistic 27.554549886
synodic 29.530588861


22 posted on 12/18/2020 1:14:18 PM PST by Lonesome in Massachussets ("Women's intuition" gave us the Salem witch trials and Kavanaugh hearings. Change my mind.)
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