public GeoPoint(final PlanetModel planetModel,final double lat,final double lon){
  this(planetModel,Math.sin(lat),Math.sin(lon),Math.cos(lat),Math.cos(lon),lat,lon);
}

public GeoPoint ( final PlanetModel planetModel , final double lat , final double lon ) { this ( planetModel , Math . sin ( lat ) , Math . sin ( lon ) , Math . cos ( lat ) , Math . cos ( lon ) , lat , lon ) ; }
construct a geopoint from a latitude / longitude pair .
