sidereal clock


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Related to sidereal clock: sidereal time

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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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.
Nearly every issue of Sky & Telescope once carried ads for sidereal clocks. Then came setting circles with adjustable pointers, followed by digital readouts and Go To mounts, bypassing any real need for you to know sidereal time to point a telescope.
If sidereal clocks were a bit too pricey for the Birmingham public, the ones which simply told terrestrial time were another matter indeed.