variants:
or zenith tube
Definition of zenith telescope
: a telescope that is installed in a fixed vertical position so that it can be used only to observe stars crossing the meridian near the zenith which is at the center of its field of view and that is used for precise time and latitude determinations
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“Zenith telescope.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/zenith%20telescope. Accessed 6 Mar. 2021.
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