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abstraction > mathematical concept > geometrical object > point > coordinate > local coordinate > nadir
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nadir comparison table
Subject has definition is opposite of has synonym is a kind of has azimuth is an instance of has antonym has elevation
local coordinate   coordinate    
nadirThe point on the celestial sphere diametrically opposite to the zenith in the direction of gravity.zenithdownward 0local coordinatezenith-90

Next local coordinatenorth point    Uplocal coordinate    Previous local coordinateeast point