;).
      Repeating the process until the estimates of 'lt' converge yields
      the &quot;converged Newtonian&quot; light time estimate (&quot;CN&quot;).
      
      Subtracting the geometric position of the observer O(et) gives 
      the position of the target body relative to the observer: 
      T(et-lt) - O(et). 
 
         SSB ---&gt; O(et) 
          | \     | 
          |  \    | 
          |   \   | T(et-lt) - O(et) 
          |    \  | 
          V     V V 
         T(et)  T(et-lt) 
       
   