meridian circle

'meridian circle' can also refer to...


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A telescope with an accurately calibrated circle which is constrained to rotate in the plane of the meridian about an east-west horizontal axis. The altitude at which the telescope is aimed at the time of an observation is obtained by measuring the circle divisions with a series of fixed microscopes, usually four or six. See also Transit Circle.

Subjects: Astronomy and Astrophysics.

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