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abstraction > mathematical concept > geometrical object > point > coordinate > local coordinate
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local coordinate comparison table
Subject has definition is opposite of has synonym has azimuth has antonym has elevation
east pointThe point on the celestial horizon 90° clockwise from the north point. At the equinoxes the Sun rises in the east point.  90 0
nadirThe point on the celestial sphere diametrically opposite to the zenith in the direction of gravity.zenithdownward0zenith-90
north pointThe point at which the meridian intersects the horizon below the north celestial pole.  0 0
zenithThe point on the celestial sphere directly above the observer's head - i.e., opposite to the direction of gravity (nadir).nadir 0nadir90

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