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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>
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 point of the celestial sphere that is directly opposite the zenith and vertically downward from the observer.''
'''Etymology:''' Middle English, from Middle French, from Arabic naḍhīr opposite
Date: 15th century. <ref>[http://www.m-w.com/dictionary/nadir Nadir] Merriam-Webster Online Dictionary </ref>
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