Sidereal clock

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an astronomical clock regulated to keep sidereal time.
See under Clock, Day, etc.

See also: Clock, Sidereal

References in periodicals archive ?
If sidereal clocks were a bit too pricey for the Birmingham public, the ones which simply told terrestrial time were another matter indeed.
Matthew Boulton's famous sidereal clock, made at his manufactory in 1771, has vanished from the drawing room.
Nearly every issue of Sky & Telescope once carried ads for sidereal clocks.