horizons.py 文件源码

def xyz(self):
        """
        *Astropy.CartesianRepresentation*

        return X,Y,Z positions based on RA, DEC and distance
        """
        if self._xyz is None:
            ra_dec = [
                text.decode('UTF-8') for text in self.data_lists['ra_dec']]
            self._xyz = SkyCoord(
                ra_dec, distance=self.data_lists['distance'],
                unit=(u.hourangle, u.deg, u.au)).cartesian
        return self._xyz