Sidereal Clock - A clock that marks the local hour angle of the vernal equinox
Sidereal Day - The length of time (23 hours, 56 minutes, 4.091 seconds) between successive appearances of a star on the meridian ...
Sidereal clock
Star clocks
Stellar navigationOther
Nursery rhyme Twinkle twinkle little star
Stars and planetary systems in fiction ...
The value of a sidereal clock is that it tells the astronomer the right ascension of the objects most easily seen at the moment. This information emphasizes why astronomers measure right ascension as the time on a 24 hour clock.
As an example, suppose you have a sidereal clock which keeps track of your local mean sidereal time, and it says the time is 02:00:00. The object you're interested in has a right ascension of 04:30:00.
 See also: Latitude, Equator, Earth, Rotation, Star
  
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