'Get list of names of observatories for use with
`~astropy.coordinates.EarthLocation.of_site`.
.. note::
When this function is called, it will first attempt to
download site information from the astropy data server.  If it
cannot (i.e., an internet connection is not available), it will fall
back on the list included with astropy (which is a limited and dated
set of sites).  If you think a site should be added, issue a pull
request to the
`astropy-data repository <https://github.com/astropy/astropy-data>`_ .
Returns
names : list of str
List of valid observatory names
See Also
of_site : Gets the actual location object for one of the sites names
this returns.'

@classmethod
def get_site_names(cls):

    return cls._get_site_registry().names
