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abstraction > mathematical concept > number > quantity > coordinate component > local coordinate component

local coordinate component
subject			fact

local coordinate component	is a component of local coordinate
	is a kind of coordinate component
quantity	has unit
number	has value

Kinds of local coordinate component :

• azimuth (4 facts) - Directional bearing around the horizon, measured in degrees from north (0°)., Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith.
• elevation (6 facts) (altitude) - The angle in degrees above the horizon toward the zenith or overhead point. Sometimes loosely called the "altitude" of a star, but not to be confused with height above sea level. Elevation angle is 90° minus the zenith distance (or zenith angle)., Angular distance above the horizon., The angular distance of a celestial body above or below the horizon, measured along the great circle passing through the body and the zenith. Elevation is 90 deg. minus zenith distance.
• zenith distance (3 facts) - Angular distance on the celestial sphere measured along the great circle from the zenith to the celestial object. Zenith distance is 90° minus altitude.