Fix: Sign of T^3 term in mean perigee/apogee time#33
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Per Meeus Astronomical Algorithms formula (50.1), the cubic (T³) term is subtracted, not added.
Excerpt from the book:
Another reference:
https://github.com/hodinkee/aaplus/blob/29c6a5bfbff23edcb6a8f1018e83280d1eaf2ccc/src/AAMoonPerigeeApogee.h#L57