Fluttering moon
Hi Mike,
Question 1, I'd better leave to someone else (a man's gotta know his limitations!).
Question 2, the moon's plane of orbit is not on the same plane as earth's, there is a slight tilt, how much I'm don't know.
Combined with earth's axial tilt, the moon's flutter is a seasonal variation, which can also be seen in it's varing tidal influence during the year.
Hope that's a start.
Mental
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