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1. of, relating to, or involving the stars
2. determined with reference to one or more stars
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
sidereal(sÿ-deer -ee-ăl) Relating to or measured or determined with reference to the stars.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Referring to a quantity, such as time, to indicate that it is measured in relation to the apparent motion or position of the stars.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Of or pertaining to the stars. Although sidereal generally refers to the stars and tropical to the vernal equinox, sidereal time and the sidereal day are based upon the position of the vernal equinox relative to the meridian. The sidereal year is based upon the stars.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved