Perihelion meaning

pĕrə-hēlē-ən, -hēlyən
The point in a solar orbit where the orbiting body is closest to the sun.
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The point nearest the sun in the orbit of a planet, comet, or man-made satellite.
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The point at which an orbiting object, such as a planet or a comet, is closest to the Sun.
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(astronomy) The point in the elliptical orbit of a planet or comet etc. where it is nearest to the Sun.
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Origin of perihelion

  • Alteration of New Latin perihēlium peri– Greek hēlios sun sāwel- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition