aphelion /apˈhiːlɪən/


I. noun

[Astronomy] the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun

Mars is at aphelion.
The opposite of perihelion.
– origin mid 17th cent.: alteration of modern Latin aphelium (by substitution of the Greek inflection -on), from Greek aph’ hēlion ‘from the sun’.

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