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abstraction > mathematical concept > geometrical object > point > coordinate > local coordinate > zenith

zenith comparison table

Subject	has definition	is opposite of	is a kind of	has azimuth	is an instance of	has antonym	has elevation
local coordinate			coordinate
zenith	The point on the celestial sphere directly above the observer's head - i.e., opposite to the direction of gravity (nadir).	nadir		0	local coordinate	nadir	90

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