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Related to sidereal clock: sidereal time
sidereal clockA clock regulated to measure the sidereal time at an observatory. See also transit circle.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
sidereal clock[sī′dir·ē·əl ′kläk]
A clock set at 0 hours 0 minutes 0 seconds (midnight) as the vernal equinox crosses the meridian; it is the astronomical clock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.