  computation also requires a significantly
                             greater number of CPU cycles than does the
                             one-iteration light time correction.
 
                  &quot;CN+S&quot;     Converged Newtonian light time 
                             and stellar aberration corrections. 

   obsrvr      is the name of the observing body.  This is typically a
               spacecraft, the earth, or a surface point on the earth.
               `obsrvr' is case-insensitive, and