def distance(p_a, p_b):
    """ Euclidean distance, between two points

    Args:
        p_a (:obj:`Point`)
        p_b (:obj:`Point`)
    Returns:
        float: distance, in degrees
    """
    return sqrt((p_a.lat - p_b.lat) ** 2 + (p_a.lon - p_b.lon) ** 2)