periastron (pĕrˌēăsˈtrən) [key]: see apsis.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on periastron from Fact Monster:

  • apsis - apsis apsis (pl. apsides), point in the orbit of a body where the body is neither approaching nor ...
  • Encyclopedia: Astronomy: General - Encyclopeadia articles concerning Astronomy: General.

See more Encyclopedia articles on: Astronomy: General

Play Hangman

Play Poptropica

Play Quizzes

Play Tic Tac Toe