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zenith tube
noun
, Astronomy.
- a telescope mounted to point only at the zenith, used at some observatories for measuring time by the stars.
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Word History and Origins
Origin of zenith tube1
First recorded in 1830–40
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Example Sentences
He devised a reflex zenith tube, in which the zenith point was determined by reflection from a surface of mercury.
From Project Gutenberg
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