astronomical clock

astronomical clock

noun
1.
a clock indicating or representing the movements of the sun or planets, the phases of the moon, or the sky visible at a given time, used as a means of establishing time or for additional information, as locating celestial bodies or timing their movement.
2.
a clock used for observing the apparent time of the meridian passages of heavenly bodies.

Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
astronomical clock
 
n
1.  a complex clock showing astronomical phenomena, such as the phases of the moon
2.  any clock showing sidereal time used in observatories

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