aphelion Hear it!

aphelion definition

apheli·on (ə fē′lē ən, -fēl′yən)

noun pl. aphelions -·li·ons or aphelia -·lia (-ə)

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

Etymology: ModL, altered (as if Gr) by Johannes Kepler < earlier aphelium < Gr apo-, from + hēlios, sun; modeled on L apogaeum, apogee

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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