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zenith eyepiece

noun
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Definition of zenith eyepiece

: an eyepiece or adapter containing a right-angle prism or a plane mirror to reflect the rays from an object near the zenith to the side of a refracting telescope for more convenient observation

— called also diagonal eyepiece

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“Zenith eyepiece.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/zenith%20eyepiece. Accessed 14 December 2019.

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