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perihelion

[ per-uh-hee-lee-uhn, -heel-yuhn ]

noun

, Astronomy.
, plural per·i·he·li·a [per-, uh, -, hee, -lee-, uh, -, heel, -y, uh].
  1. the point in the orbit of a planet or comet at which it is nearest to the sun.


perihelion

/ ˌpɛrɪˈhiːlɪən /

noun

  1. the point in its orbit when a planet or comet is nearest the sun Compare aphelion
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


perihelion

/ pĕr′ə-hēlē-ən /

  1. The point at which an orbiting object, such as a planet or a comet, is closest to the Sun.
  2. Compare aphelion


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Other Words From

  • peri·heli·al peri·heli·an adjective
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Word History and Origins

Origin of perihelion1

1660–70; < Greek peri- peri- + hḗli ( os ) sun + -on neuter noun suffix, on the model of perigee; earlier in the New Latin form perihelium
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Word History and Origins

Origin of perihelion1

C17: from New Latin perihēlium, from peri- + Greek hēlios sun
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Compare Meanings

How does perihelion compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

The point where a planet’s orbit comes closest to the sun is its perihelion.

I'm not trying to calculate the perihelion of Jupiter or do 3D renderings of the National Cathedral.

The direction of the axis major of the orbit, which was found by calculating the longitude of the comet's perihelion.

The comet returned at the appointed time; and on the 12th of March, 1759, reached its perihelion.

At its perihelion it travels thousands of leagues per minute; at its aphelion it does not pass over more than a few yards.

The only sensible effect will be a secular motion of the perihelion.

The motion of Mercury's perihelion would therefore be 7´´ in the theory of Lorentz and 5´´.6 in that of Abraham.

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