Angle between the horizontal and the direction of concern.
The angular distance between the horizon and an object in the sky, such as the sun. The zenith angle is 90° minus the elevation angle.
the angle from the GPS receiver's antenna between the horizontal and the line of sight to the satellite
The inclination (in degrees) of the satellite's position in space relative to the horizon.
The angle between the local horizon and an object in the sky, measured positively from the horizon upwards.
the angular deviation from the horizontal to which a surveying instrument's telescope has been raised to sight a target.
The angle between the horizontal plane and the line of sight to a target or object.
(Also called elevation.) The angle between the horizon and a point above the horizon, measured along the arc that passes through the zenith and the point in question. In astronomy this is termed altitude. Compare azimuth, depression angle, zenith distance.