as'tronom'ical clock'

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

astronomicalastronomical frame of reference

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