英语翻译Azimuth(方位角) is the horizontal angle measured in a clock

英语翻译
Azimuth(方位角) is the horizontal angle measured in a clockwise direction from the plane of the meridian ,which is a line on the mean surface of the earth joining the north and south poles.
The bearing(方位) ,which can be measured clockwise or counterclockwise from the north or south end of the meridian,is always accompanied by letters that locate the quadrant in which the line falls.
The zenith(天顶角) is an angle measured in a vertical plane downward from an upward directed vertical line through the instrument.