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What (who) is meridian circle - definition
Meridian circle
![The Ron Stone/Flagstaff Astrometric Scanning Transit Telescope of the [[United States Naval Observatory Flagstaff Station]], built by Farrand Optical Company, 1981](https://commons.wikimedia.org/wiki/Special:FilePath/FASTT Transit Circle.jpg?width=200 "The Ron Stone/Flagstaff Astrometric Scanning Transit Telescope of the [[United States Naval Observatory Flagstaff Station]], built by Farrand Optical Company, 1981")
![The 6-inch transit circle of the [[U.S. Naval Observatory]], built by Warner and Swasey, 1898](https://commons.wikimedia.org/wiki/Special:FilePath/TransitCircle USNO.jpg?width=200 "The 6-inch transit circle of the [[U.S. Naval Observatory]], built by Warner and Swasey, 1898")
ASTRONOMICAL INSTRUMENT FOR TIMING OF THE PASSAGE OF STARS
Transit circle; Meridian Circle; Mural circle; Meridian telescope; Transit Circlet; Transit Circle; Declination circle; Meridian-circle; Rota meridiana; Meridian circles
The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a culmination, while at the same time measuring their angular distance from the nadir. These are special purpose telescopes mounted so as to allow pointing only in the meridian, the great circle through the north point of the horizon, the north celestial pole, the zenith, the south point of the horizon, the south celestial pole, and the nadir.
meridian circle
ASTRONOMICAL INSTRUMENT FOR TIMING OF THE PASSAGE OF STARS
Transit circle; Meridian Circle; Mural circle; Meridian telescope; Transit Circlet; Transit Circle; Declination circle; Meridian-circle; Rota meridiana; Meridian circles
¦ noun Astronomy a telescope mounted so as to move only on a North-South line, for observing the transit of celestial objects across the meridian.
transit circle
ASTRONOMICAL INSTRUMENT FOR TIMING OF THE PASSAGE OF STARS
Transit circle; Meridian Circle; Mural circle; Meridian telescope; Transit Circlet; Transit Circle; Declination circle; Meridian-circle; Rota meridiana; Meridian circles
(also transit instrument)
¦ noun another term for meridian circle.
