A unit of angular distance equal to one thousandth of a milliradian.
角距离单位等于(待查表)毫弧。
Horizon latitude: the angular distance of a celestial object above the horizon.
地平纬度：地平线以上天体的角度距离。
Angular distance is the distance between two objects measured as an Angle from a given point.
角距离，是由一定点到两物体之间所量度的夹角。
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