The astronomical information which can be displayed by one of these timepieces can include the position of the sun, the moon, and various constellations, the phases of the moon, the date of eclipses and other astronomically important events, and just about anything that has to do with the state and position of heavenly bodies.It is important to note that an astronomical clock is different from an astronomical regulator, which is designed to maintain a steady rate of time, as a unit of measure when making astronomical measurements.

One of the oldest devices that could be considered an astronomical clock is the Antikythera mechanism, built in the 2nd century B.C. While this device wasn't a clock, it was a mechanical device that was used to determine the position of certain celestial bodies. Posidonius' orrery is a device built later on in the first century A.D. and which functioned in roughly the same manner.One of the most impressive astronomical clocks ever built was designed and executed by horologist Su Song, during China's Song dynasty. This is was a water clock, attached to a clock tower, which was one of the earliest known timepieces to use escarpment. This clock powered an armillary sphere, which moved various symbols around in accordance with known astrological occurrences.

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