Distance between coordinates in Java, Haversine formula

class GeoPoint {

 private static final double EARTH_RADIUS = 6372.797560856;

 double lat;
 double lon;

 public GeoPoint(double lat, double lon) {
 this.lat = lat;
 this.lon = lon;
 }

 public double distance(GeoPoint other) {

 double lat1 = Math.toRadians(this.lat);
 double lon1 = Math.toRadians(this.lon);

 double lat2 = Math.toRadians(other.lat);
 double lon2 = Math.toRadians(other.lon);

 double dlon = lon2 - lon1;
 double dlat = lat2 - lat1;
 double a = Math.pow(Math.sin(dlat / 2), 2) + Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(dlon / 2), 2);

 return 2 * EARTH_RADIUS * Math.asin(Math.sqrt(a));
 }

}