nadir"1. Satellite subpoint on the earth's surface that is centered directly below the satellite. This is also referred to as the point of zero nadir angle for a satellite in earth orbit. 2.
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The point on any given observer's celestial sphere diametrically opposite of one's zenith.
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Nadir
The point on any given observer's celestial sphere diametrically opposite of one's zenith.
NAM ...
Nadir Point on Earth directly beneath a satellite, the opposite of zenith. Compare with subsatellite point.
Nano See International System of Units.
Zenith, Nadir, and the Celestial Sphere "Zenith," "nadir," and the "celestial sphere" are terms used by meteorologists, climatologists, and other scientists with reference to astronomical positions.
The nadir was reached in February 1983, with record low rainfall in parts of Tasmania, and virtually none at all in Victoria.
ZENITH The point which is elevated 90 degrees from all points on a given observer's astronomical horizon. The point on any given observer's celestial sphere that lies directly above him. The opposite of nadir.
a great circle on the celestial sphere equidistant from the observer's zenith and nadir). It is the projection of a horizontal plane in every direction from the point of orientation. 5) Celestial horizon (also called rational horizon, ...
 See also: Horizon, Surface, Air, Earth, Weather
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