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| abstraction > mathematical concept > geometrical object > point > coordinate > local coordinate > nadir | 
| 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 | |||||||
| nadir | The point on the celestial sphere diametrically opposite to the zenith in the direction of gravity. | zenith | downward | 0 | local coordinate | zenith | -90 | 
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