code: public static final double bearing(double lat1, double lon1, double lat2, double lon2)
      {
          return Math.toDegrees(radBearing(lat1, lon1, lat2, lon2));
      }
docs: Returns bearing from (lat1, lon1) to (lat2, lon2) in degrees
  @param lat1
  @param lon1
  @param lat2
  @param lon2
  @return