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abstraction > mathematical concept > number > quantity > angle > zenith distance
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zenith distance comparison table
Subject is an instance of has unit is a kind of is a component of has definition
angle angle unitquantity  
local coordinate component  coordinate componentlocal coordinate 
zenith distanceangleangle unit local coordinateAngular distance on the celestial sphere measured along the great circle from the zenith to the celestial object. Zenith distance is 90° minus altitude.

Next angleangular size    Upangle, local coordinate component    Previous angleterrestrial longitude