Word:

Astronomical clock

See under Clock.
A clock of superior construction, with a compensating pendulum, etc., to measure time with great accuracy, for use in astronomical observatories; - called a regulator when used by watchmakers as a standard for regulating timepieces.
A clock with mechanism for indicating certain astronomical phenomena, as the phases of the moon, position of the sun in the ecliptic, equation of time, etc.

See also: Astronomical Clock Clock

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-- Astronomical clock --
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