aph·elion /æˈfiljən/
遠日點
A·phel·ion n.; pl. Aphelia Astron. 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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aphelion
n : apoapsis in solar orbit; the point in the orbit of a planet
or comet that is at the greatest distance from the sun
[ant: perihelion]
[also: aphelia (pl)]