point' need not be visible from the
               observer's location at time `et'.

               
   plid        is the integer ID of the plate on which `spoint' is
               located. If `spoint' was found by calling any of the
               routines

                  <a href="dskx02_c.html">dskx02_c</a>
                  <a href="subpt_pl02.html">subpt_pl02</a>
                  <a href="subsol_pl02.html">subsol_pl02</a>

               `plid' is the plate ID returned by the called routine.
</PR