he target---the position 
                             as seen by the observer. 
 
                  &quot;CN&quot;       Converged Newtonian light time
                             correction. In solving the light time
                             equation, the &quot;CN&quot; correction iterates
                             until the solution converges (three
                             iterations on all supported platforms).
                             Whether the &quot;CN+S&quot; solution is
          