public function getDistance(Coordinate $point1, Coordinate $point2)
{
if ($point1->getEllipsoid() != $point2->getEllipsoid()) {
throw new NotMatchingEllipsoidException("The ellipsoids for both coordinates must match");
}
$lat1 = deg2rad($point1->getLat());
$lat2 = deg2rad($point2->getLat());
$lng1 = deg2rad($point1->getLng());
$lng2 = deg2rad($point2->getLng());
$dLat = $lat2 - $lat1;
$dLng = $lng2 - $lng1;
$radius = $point1->getEllipsoid()->getArithmeticMeanRadius();
$distance = 2 * $radius * asin(sqrt(pow(sin($dLat / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($dLng / 2), 2)));
return round($distance, 3);
}