Answer: apsides

AnswerCrossword Clue
APSIDESPoints in the moon's orbit.
APSIDESPoints in an orbit.
apsideseither of two points in an eccentric orbit, one (higher apsis) farthest from the center of attraction, the other (lower apsis) nearest to the center of attraction
apsidesAPSIS, an apse (a semicircular recess)
apsidesapse