docs: public double calcOrientation(double lat1, double lon1, double lat2, double lon2, boolean exact) {
          double shrinkFactor = cos(toRadians((lat1 + lat2) / 2));
          if (exact)
              return Math.atan2(lat2 - lat1, shrinkFactor * (lon2 - lon1));
          else
              return atan2(lat2 - lat1, shrinkFactor * (lon2 - lon1));
      }