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The graduation of an angle would usually be expressed in degrees, of which there are 360 for a complete circle.
Height or altitude.
Messier 14 or NGC 6402 has an apparent dimension of 11 minutes of arc.
It is angular displacement which may be measured in radians, or degrees-minutes-seconds. In 3-D it would be stradians
An XY intercept is the point that lays in a two dimensional plane where a line representing an X dimension in that plane and a transverse line at a right angle representing a Y dimension in the same plane intersect.