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aphelion has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is perihelion.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
Synonyms, antonyms and the broader and narrower relations for aphelion come from Princeton University’s WordNet. Full sources and licences.