iphone - How can we find the angle between two locations defined by latitude or longitude

Question

I do not want any code but want to get reference that how can we find the angle between two locations defined by Latitude or Longitude...

If you do have reference then Please help me to solve my problem...

Thanx in advance....

Answer 1

The formula to calculate bearing is:

θ = atan2( sin(Δlong).cos(lat2), cos(lat1).sin(lat2) ? sin(lat1).cos(lat2).cos(Δlong) )

Bearing is a direction to move from one location to another location (starting from north and then clockwise). While angle in 2D starts from the east and then counter clockwise. So if an angle is what you need, later you'll need to add 90 degree to the result and then revert it (add minus).

Reference: http://www.movable-type.co.uk/scripts/latlong.html