docs: public static double distance(DLocation p1, DLocation p2) {
  		double p1lat = Math.toRadians(p1.getLatitude());
  		double p1lon = Math.toRadians(p1.getLongitude());
  		double p2lat = Math.toRadians(p2.getLatitude());
  		double p2lon = Math.toRadians(p2.getLongitude());
  		return distance(p1lat, p1lon, p2lat, p2lon);
  	}