I am wondering. I am sure that they are related. How can we derive one from the other?

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    $\begingroup$ The relationship appears to be strongly related to the difference between sidereal and draconic months. You might start by looking at en.wikipedia.org/wiki/Lunar_precession and the reference documents listed there. $\endgroup$ – Carl Witthoft Dec 17 '18 at 18:49

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