function Median($lat1, $long1, $lat2, $long2)
	{
		$Bx = cos(deg2rad($lat2)) * cos(deg2rad($long2-$long1));
		$By = cos(deg2rad($lat2)) * sin(deg2rad($long2-$long1));
		$lat3 = atan2(sin(deg2rad($lat1))+ sin(deg2rad($lat2)),  sqrt( (cos(deg2rad($lat1))+$Bx)*(cos(deg2rad($lat1))+$Bx) + $By* $By) );
		$long3 = deg2rad($long1) + atan2($By, cos(deg2rad($lat1)) + $Bx);

		return $long3*(180/PI())  . "," . $lat3*(180/PI()) ;
	}