Meridian Circle - An Instrument For Timing Of The Passage Of Stars Across The L ...
Stockphoto ID: 3732285
File name: 345502.jpg
Format: digital, 6000+ pixels longest side
Property release: no Model release: no
Source: photo agency Based in: United Kingdom
Description: Meridian circle - an instrument for timing of the passage of stars across the local meridian, an event known as a transit, 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 zenith, the south point of the horizon, and the nadir. Meridian telescopes rely on the rotation of the Earth to bring objects into their field of view and are mounted on a fixed, horizontal, east-west axis.
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