def METHOD_NAME(longitude_1, latitude_1, longitude_2, latitude_2):
    """Haversine distance between two points.
       From https://github.com/tkrajina/gpxpy/blob/master/gpxpy/geo.py
       Implemented from http://www.movable-type.co.uk/scripts/latlong.html
       We don't really want the distance, rather the interior angle.
       Return angle in degrees.
    """
    d_lat = math.radians(latitude_1 - latitude_2)
    d_lon = math.radians(longitude_1 - longitude_2)
    lat1 = math.radians(latitude_1)
    lat2 = math.radians(latitude_2)
    a = math.sin(d_lat / 2) * math.sin(d_lat / 2) + \
        math.sin(d_lon / 2) * math.sin(d_lon / 2) * \
        math.cos(lat1) * math.cos(lat2)
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
    return math.degrees(c)