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angular distance
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 directions originating from the observer and pointing towards these two objects.
==Use==
Angular distance (or separation) is technically synonymous to angle itself, but is meant to suggest the (often large or unknown) linear ''distance'' between these objects (for instance stars, as they are observed from Earth).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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