Angular Difference

Definition: This is the angle subtended by the arc length joining two points on the surface of the earth. When the two points are in the same direction i.e. West, West or East, East or North, North or South, South, the difference of the angles gives the angular difference between the two points, however, if the two points are in different direction i.e. West, East or North, South, the sum of the angles gives the angular difference between the two points.

Different directions of longitudes