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90s Slang You Should Know

zenith tube

noun, Astronomy.
1.
a telescope mounted to point only at the zenith, used at some observatories for measuring time by the stars.
Also called zenith telescope.
Origin of zenith tube
1830-1840
First recorded in 1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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