sidereal clock

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sidereal clock

A clock regulated to measure the sidereal time at an observatory. See also transit circle.

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.
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I've been looking for a small, portable sidereal clock.
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.