periapsis
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periapsis
(pe-ree-ap -sis) See apsides.Collins Dictionary of Astronomy © Market House Books Ltd, 2006
periapsis
[‚per·ē′ap·səs] (astronomy)
The orbital point nearest the center of attraction of an orbiting body.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.