perihelion

Noun. (astronomy) The point in the elliptical orbit of a planet or comet etc where it is nearest to the sun.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.