Etymology
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aphelion (n.)

"point farthest from the sun" (of a celestial body's orbit), 1670s, a Grecianized form of Modern Latin aphelium (itself attested in English from 1650s), coined by Johannes Kepler based on Greek apo hēliou "away from the sun." The word is thus an assimilated form of apo "away from" (see apo-) + hēliou, genitive of hēlios "sun" (from PIE root *sawel- "the sun"), formed on the model of Ptolemaic apogaeum (see apogee) to reflect the new heliocentric model of the universe.

updated on September 23, 2022

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