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zenith - [astronomy] In astronomy, the point on the celestial sphere directly above an observer. Both the zenith and nadir lie on the observer's meridian; the zenith lies 180 degrees from the nadir, and is observable.
[Category=Geospatial ]
Source: esri, 16 October 2012 09:20:54, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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