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Encyclopediaapastronapastron (upăs'trun) [key]: see apsis. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on apastron from Infoplease:
- 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.
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