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Nadir - definition(s)


(1) [aerial photography] In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens.

(2) [astronomy] In astronomy, the point on the celestial sphere directly beneath an observer. Both the nadir and zenith lie on the observer's meridian; the nadir lies 180 degrees from the zenith and is therefore unobservable.

[Category=Geospatial ]

Source: esri, 16 June 2012 09:09:50, External 

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