The point on the orbit of a celestial body that is farthest from the sun.
The point farthest from the sun in the orbit of a planet or comet, or of a man-made satellite in orbit around the sun.
The point at which an orbiting body, such as a planet or comet, is farthest away from the Sun.
Origin of aphelion
- From New Latin aphēlium Greek apo- apo- Greek hēlios sun sāwel- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition