Definitions
aphelion Tweet Definition of aphelion Like Definition of aphelion on Facebook
noun (aphelia)
  1. The point in the elliptical orbit of a planet, comet, etc., where it is farthest from the sun.
Etymology: Greek form of aphelium, from Ancient Greek (polytonic, á) "from" (with o-elision) + (polytonic, á) "sun" (modelled after apogaeum). Compare parhelion.


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