an angle related to a distance around the earth’s horizon, used to find out the position of a star, planet, etc. 方位角,地平经度(用以找出恒星、行星等的方位) Word Originlate Middle English (denoting the arc of a celestial circle from the zenith to the horizon): from Old French azimut, from Arabic as-samt, from al ‘the’ + samt ‘way, direction’.