方位，相对位置：方向，尤指用地理学的或天体图线测量的从一个固定位置到另一个位置的带有角度的方向。
Direction, especially angular direction measured from one position to another using geographical or celestial reference lines.
方位角观察者通过测量所具有的水平角度，从某一参考方向顺时针测量，如从北部或从参考天体处，通常从北极星。
The horizontal Angle of the observer's bearing in surveying, measured clockwise from a referent direction, as from the north, or from a referent celestial body, usually Polaris.
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