public function getNeighbours($limit = 10, $radius = 10, $culture = null)
{   
 if($culture === null)
 {
   $culture = sfContext::getInstance()->getUser()->getCulture();
 }
 $lat = $this->getLat();
 $lon = $this->getLon();
 $query = new Doctrine_Query();     
 $locations =  $query->select("l.*, (((ACOS(SIN(($lat*PI()/180)) * SIN((l.lat*pi()/180)) + COS(($lat*PI()/180)) * COS((l.lat*PI()/180)) * COS((($lon - l.lon)*PI()/180))))*180/PI())*60*1.1515) distance")         
        ->from('Location l , Location.LocationI18n i18n')
        ->limit($limit)
         // not current location
        ->where('l.id != ? AND i18n.culture = ?', array($this->getId(), $culture))
        ->having('distance < ?', $radius)
        ->execute();         
        return $locations;       
}