Difference between revisions of "Nadir"
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Revision as of 21:31, October 13, 2007
Point on Earth directly beneath a satellite, the opposite of zenith. Compare with subsatellite point. [1]
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. [2]
References
- ↑ NASA Earth Observatory glossary
- ↑ Nadir Merriam-Webster Online Dictionary