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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“I do believe that the buck stops here, that I cannot rely upon public opinion polls to tell me what is right. I do believe that right makes might and that if I am wrong, 10 angels swearing I was right would make no difference.”
Also called zenith telescope.

Origin of zenith tube

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020