astronomical clock

noun

Definition of astronomical clock

1 : a high-precision clock (such as a Riefler clock or a quartz-crystal clock) used in an astronomical observatory to time the movements of celestial bodies or assist in locating them or to serve as the basis of standard time
2 : a clock with mechanism and dials for indicating various astronomical phenomena (such as phases of the moon, movements of the planets)

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“Astronomical clock.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/astronomical%20clock. Accessed 7 December 2019.

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