src/Bearing/BearingSpherical.php
public function calculateBearing(Coordinate $point1, Coordinate $point2): float
    {
        $lat1 = deg2rad($point1->getLat());
        $lat2 = deg2rad($point2->getLat());
        $lng1 = deg2rad($point1->getLng());
        $lng2 = deg2rad($point2->getLng());

        $y = sin($lng2 - $lng1) * cos($lat2);
        $x = cos($lat1) * sin($lat2) - sin($lat1) * cos($lat2) * cos($lng2 - $lng1);

        $bearing = rad2deg(atan2($y, $x));

        if ($bearing < 0) {
            $bearing = fmod($bearing + 360, 360);
        }

        return $bearing;
    }
public function calculateBearing(Coordinate $point1, Coordinate $point2): float
    {
        $lat1 = deg2rad($point1->getLat());
        $lat2 = deg2rad($point2->getLat());
        $lng1 = deg2rad($point1->getLng());
        $lng2 = deg2rad($point2->getLng());

        $y = sin($lng2 - $lng1) * cos($lat2);
        $x = cos($lat1) * sin($lat2) - sin($lat1) * cos($lat2) * cos($lng2 - $lng1);

        $bearing = rad2deg(atan2($y, $x));

        if ($bearing < 0) {
            $bearing = fmod($bearing + 360, 360);
        }

        return $bearing;
    }
This method calculates the initial bearing between the
two points.

@param Coordinate $point1
@param Coordinate $point2

@return float Bearing Angle