 vector is the apparent
         position of the illumination source, corrected for light
         time and stellar aberration, as seen from the target body
         at time et-lt.


   Using DSK data
   ==============

      DSK loading and unloading
      -------------------------

      DSK files providing data used by this routine are loaded by
      calling <a href="cspice_furnsh.html">cspice_furnsh</a> and can be unloaded by calling <a href="cspice_unload.html">cspice_unload</a> or
      <a href="cspi