Finds the next lunar apsis (perigee or apogee) in a series.
Given a lunar apsis returned by an initial call to SearchLunarApsis,
or a previous call to NextLunarApsis, finds the next lunar apsis.
If the given apsis is a perigee, this function finds the next apogee, and vice versa.
Finds the next lunar apsis (perigee or apogee) in a series.
Given a lunar apsis returned by an initial call to SearchLunarApsis, or a previous call to
NextLunarApsis, finds the next lunar apsis. If the given apsis is a perigee, this function finds the next apogee, and vice versa.