A zenith telescope is a type of telescope that is designed to point straight up at or near the zenith. They are used for precision measurement of star positions, to simplify telescope construction, or both. A classic zenith telescope, also known as a zenith sector employs a strong altazimuth mount, fitted with levelling screws. Extremely sensitive...
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http://en.wikipedia.org/wiki/Zenith_telescope
Instrument for observing stars near the zenith (a point on the celestial sphere directly above the observer's position). See also: Zenith.
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https://www.encyclo.co.uk/local/20687
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