Pronunciation: [ uh-fee-lee-uhn ]
The point farthest from the sun in the path of an orbiting celestial body (such as a planet)
Origin: 1650; Greek
Etymology: alteration of modern Latin aphelium (by substitution of the Greek inflection -on ), from Greek aph' hēlion ‘from the sun'
point of apoapsis
Example: The satellite arrived at the aphelion—the farthest point from the sun.