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abstraction > mathematical concept > number > quantity > angle > elevation

elevation (altitude)
subject			fact

elevation	has synonym altitude
	has definition 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).
	has definition Angular distance above the horizon.
	has definition 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.
	is an instance of local coordinate component
	is an instance of angle
local coordinate component	is a component of local coordinate
angle	has unit angle unit
number	has value