Furthest Point From the Sun in an Object’s Orbit
Puzzle 5 of The Moon Hard Pack
Question is: Furthest Point From the Sun in an Object’s Orbit
and the answer is: APHELION
Word Meaning:
APHELION — (astronomy, also figuratively) The point in the elliptical orbit of a comet, planet, or other astronomical object, where it is farthest from the Sun.
Definitions from Wiktionary.