æˈfɪliən

Definitions

1. adjective

relating to or denoting the tendency of the aphelion, or the point in the orbit of a celestial body at which it is farthest from the Sun.

“The aphelian orbit of Pluto has been a subject of interest in the astronomy community.”

2. noun

a point in the orbit of a celestial body that is farthest from the Sun.

“The aphelion of Earth is about 152.1 million kilometers away from the Sun.”