Transit circle

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(Astron.) a transit instrument with a graduated circle attached, used for observing the time of transit and the declination at one observation. See Circle, n., 3.

See also: Transit

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
A six feet transit circle erected at Greenwich Observatory by Edward Troughton.
Centenaries for 2012
The Meridian building houses an impressive collection of telescopes, including the Airy Transit Circle, a 10ft instrument which defined the Greenwich Meridian until 1850.
A mean time in Greenwich: the restored and expanded displays at the Royal Observatory make for a fun day out for all the family
Display Cupboard 5: The bottom shelf contains remnants of the 'Airy Transit Circle' which used to occupy one room of the main building of the Royal Observatory.
The Astronomical Museum at SAAO: I.S. Glass (SAAO)
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