a telescope mounted to point only at the zenith, used at some observatories for measuring time by the stars.
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Summer is the season for basking in the warm sun and rejoicing in the freedom of summer vacation. So when the rest and relaxation is shooed away for cooler days and the start of school, it’s easy to forget that the summer season is far from over. Many consider Labor Day the final hurrah of summer, but we still have a few weeks after that …
Origin of zenith tube
First recorded in 1830–40
Also called zenith telescope.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an instrument used to determine the latitude of stars, similar to the meridian circle but fitted with an extremely sensitive level and a declination micrometer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012