.. |skycoord| replace:: `~astropy.coordinates.SkyCoord`
.. |quantity| replace:: `~astropy.units.Quantity`
.. |Angle| replace:: `~astropy.coordinates.Angle`
.. |Longitude| replace:: `~astropy.coordinates.Longitude`
.. |Latitude| replace:: `~astropy.coordinates.Latitude`
.. |baseframe| replace:: `~astropy.coordinates.BaseCoordinateFrame`