meridian circle

noun Astronomy.
  1. a transit instrument provided with a graduated vertical scale, used to measure the declinations of heavenly bodies and to determine the time of meridian transits.

Origin of meridian circle

First recorded in 1540–50
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British Dictionary definitions for meridian circle

meridian circle

noun
  1. an instrument used in astronomy for determining the declination and right ascension of stars. It consists of a telescope attached to a graduated circle
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