Compute galactic coordinates (lat, lon, distance)

def galactic_latlon(self):
        """Compute galactic coordinates (lat, lon, distance)"""
        vector = _GALACTIC.dot(self.position.au)
        d, lat, lon = to_polar(vector)
        return (Angle(radians=lat, signed=True),
                Angle(radians=lon),
                Distance(au=d))