Definitions
from The Century Dictionary.
- noun An astronomical instrument for measuring with great accuracy the zenith-distances of stars which pass near the zenith.
Etymologies
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Examples
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In the same apartment is the famous zenith-sector, twelve feet in length, with which Dr. Bradley, at Wanstead, and at Kew, made those observations which led to the discovery of the aberration and nutation: here also is Dr. Hooke's reflecting telescope, and three telescopes by Harrison.
The Mirror of Literature, Amusement, and Instruction Volume 14, No. 404, December 12, 1829 Various
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Ramsden, all of whom, however, gave the preference to the old-fashioned mural quadrant and zenith-sector over the entire circle, which Römer had already found the advantage of employing.
A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874
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