angle of elevation
Technical term used in fields such as surveying, ballistics, and astronomy to describe the vertical angle between a reference plane and a line of sight.
The surveyor accurately measured the angle of elevation.
Compound of 俯 (ふ, 'look down'), 仰 (ぎょう, 'look up'), and 角 (かく, 'angle'). The reading ふぎょうかく follows standard on'yomi.