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Astronomy. the point in the orbit of a planet or a comet at which it is farthest from the sun.
Historical Examples

The planet consequently receives nearly three times as much light and heat in perihelion as in aphelion.
The Asteroids Daniel Kirkwood

In the orbit of a planet, means the line joining its aphelion and perihelion.
The Sailor’s Word-Book William Henry Smyth

The imaginary line joining the aphelion and perihelion points in the orbit of a planet.
The Sailor’s Word-Book William Henry Smyth

The motion of Newton’s comet at aphelion may be equally slight.
The Education of Henry Adams Henry Adams

It may, perhaps, be far advanced in its aphelion,—but when to return?
The Works of the Right Honourable Edmund Burke, Vol. V. (of 12) Edmund Burke

After the fourth go round he was fully five diameters out at aphelion.
The Pirates of Ersatz Murray Leinster

At present the earth is about three millions of miles nearer the sun in perihelion than in aphelion.
The Prehistoric World E. A. Allen

It will not return before the 38th century, and will only reach its aphelion about the year 2800.
Comets and Meteors Daniel Kirkwood

At the perihelion the planet is urged from the sun and at the aphelion towards the sun.
Outlines of a Mechanical Theory of Storms T. Bassnett

It seems probable, then, that in all northern lands glaciation would commence when autumn occurred in aphelion.
Island Life Alfred Russel Wallace

noun (pl) -lia (-lɪə)
the point in its orbit when a planet or comet is at its greatest distance from the sun Compare perihelion

“point farthest from the sun” (of a celestial body’s orbit), 1670s, a Grecianized form of Modern Latin aphelium, altered by Johannes Kepler based on Greek apo heliou “away from the sun,” from apo “away from” (see apo-) + heliou, genitive of helios “sun” (see sol). The whole was formed on the model of Ptolemaic apogaeum (see apogee) to reflect the new helio-centric model of the universe.

The point at which an orbiting body, such as a planet or comet, is farthest away from the Sun. Compare apogee, perihelion.


Read Also:

  • Apheliotropic

    turning or growing away from the sun. adjective (biology) growing in a direction away from the sunlight

  • Apheliotropism

    tendency or type of growth.

  • Aphemia

    a type of aphasia characterized by the inability to express ideas in spoken words. Historical Examples Now, he knows he can talk because we all know he can, but no one knows it at present because he can’t—and that’s aphemia. Wings of the Wind Credo Harris aphemia a·phe·mi·a (ə-fē’mē-ə) n. A form of motor aphasia […]

  • Aphephobia

    noun a fear of being touched; also called haphephobia , haptephobia , thixophobia See haphephobia See haptephobia See thixophobia Word Origin Greek haphe ‘touch’

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