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Line 1:
Line 1: − − ''The point of the celestial sphere that is directly opposite the zenith and vertically downward from the observer.''
redundancy
[[Image:CenitNadir.gif|right|250px]]
[[Image:CenitNadir.gif|right|250px]]
The '''nadir''' is the point on [[Earth]] directly beneath a [[satellite]], the opposite of [[zenith]]. Compare with [[subsatellite point]]. <ref> [http://earthobservatory.nasa.gov/Library/glossary.php3?mode=all NASA Earth Observatory glossary] </ref>
The '''nadir''' is the point on [[Earth]] directly beneath a [[satellite]], the opposite of [[zenith]]. Compare with [[subsatellite point]]. <ref> [http://earthobservatory.nasa.gov/Library/glossary.php3?mode=all NASA Earth Observatory glossary] </ref>
'''Etymology:''' Middle English, from Middle French, from Arabic naḍhīr opposite
'''Etymology:''' Middle English, from Middle French, from Arabic naḍhīr opposite