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1. (n.) aphelion
the point in the orbit of a planet or a comet at which it is farthest from the sun.
Etymology: (1650–60; Hellenized form of NL aphēlium < Gk *aphēlion (diástēma) off-sun (distance), neut. of *aphēlios (adj.) =ap-ap -2+
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| Definition of 'aphelion' |
Princeton's WordNet |
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1. (noun) aphelion
apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
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| Definition of 'aphelion' |
Webster Dictionary |
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1. (noun) aphelion
that point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion
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Definitions of aphelion 
