(n) the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected, Ant.zenith
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ F., Sp., & It. nadir; all fr. Ar. nazīru's samt nadir, prop., the point opposite the zenith (as samt), in which nazīr means alike, corresponding to. Cf. Azimuth, Zenith. ] 1. That point of the heavens, or lower hemisphere, directly opposite the zenith; the inferior pole of the horizon; the point of the celestial sphere directly under the place where we stand. [ 1913 Webster ]
2. The lowest point; the time of greatest depression. [ 1913 Webster ]
The seventh century is the nadir of the human mind in Europe. Hallam. [ 1913 Webster ]
Nadir of the sun (Astron.), the axis of the conical shadow projected by the earth. Crabb. [ 1913 Webster ]
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