sidereal clock

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sidereal clock

A 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]
(horology)
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.
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I've been looking for a small, portable sidereal clock. I can find hundreds of programs for Palm Pilots and laptops but no plain, standalone sidereal digital clocks.
Similarly, AWR Technology at The Old Bakehouse, Albert Road, Deal, Kent CT14 9RD, UK (www.awrtech.co.uk; +44 1304-365918), has a model SC110 sidereal clock (about $200) that runs from a 12-volt battery and draws less than 16 milliamps.