In mathematics (in particular geometry and trigonometry) and all natural sciences (including astronomy, geophysics, etc.), the angular distance (angular separation, apparent distance, or apparent separation) between two point objects, as observed from a location different from either of these objects, is the size of the angle between the two direc...
The apparent distance between two objects on the celestial sphere measured in degrees, minutes or seconds of arc.
[n] - the angular separation between two objects as perceived by an observer
noun the angular separation between two objects as perceived by an observer; `he recorded angular distances between the stars`