 |  *  T(et+lt) - O(et)   
              /   |*      
             /   *|     
            V  V  V      
        T(et+lt)  T(et)     
 
      The position component of the light-time corrected position  
      is the vector 
 
         T(et+lt) - O(et) 
 
      If correction for stellar aberration is requested, the target 
      position is rotated away from the solar system barycenter- 
      relative velocity vector of the observer. The rotation is 
      computed as in the reception case, but the sign of