image creditThe term astronomical clock is one that is used fairly loosely. Effectively any clock that shows astronomical information - as well as the time - can be so classified. They can show the location of the sun in the sky, for example.
In addition to that they can show the position of the moon - and further information such as its phase and its age. Others go further and show the current sign of the zodiac or even go as far as showing a rotating map of the stars.
(via Robert-John)
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