You are here: Home Dictionary aphelion
Personal tools

aphelion

For a planet or other heavenly body orbiting the sun on an elliptic orbit, that point of the orbit farthest from the sun. The point closest to the sun is the perihelion. In the context of general relativity, aphelion and perihelion are of great interest as that theory predicts a slight motion of these points around the sun, cf. (relativistic) perihelion shift.