Aphelion

Aphelion

Aphelion (pronounced: /əˈfiːliən/) is a term used in Astronomy to describe the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.

Etymology

The term "Aphelion" originates from the Greek words "apo" meaning away, and "Helios" meaning sun.

Related Terms

• Perihelion: The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
• Orbit: The gravitationally curved trajectory of an object, such as the trajectory of a planet around a star.
• Astronomical unit: A unit of measurement equal to the mean distance from the center of the earth to the center of the sun.
• Elliptical orbit: An orbit in the shape of an ellipse, with the mass being orbited at one focus of the ellipse.

See Also

• Kepler's laws of planetary motion
• Heliocentrism
• Astronomical object

External links

• Medical encyclopedia article on Aphelion
• Wikipedia's article - Aphelion

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