Point de l'orbite d'une planète le plus éloigné du Soleil.
ETYM Greek ap + helios sun.
Apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun.
(pl. -lia) point in orbit most distant from sun.
The point at which an object, traveling in an elliptical orbit around the Sun, is at its furthest from the Sun.