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zenith tube

Word Origin

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. 2018.
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Word Value for zenith

18

18

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