Fix: Correct Moon's mean anomaly coefficients#32
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Per Meeus Astronomical Algorithms formula (47.4), the cubic term divisor is 69699 (not 69699.9) and the quartic term is subtracted, not added.
Excerpt from the book:
Another reference:
https://github.com/gmiller123456/astrogreg/blob/ff3415d46d2b2ffccb1a65c9b5883e84325a51fa/meeus-illuminated_fraction_of_the_moon.html#L47