ined from a
            catalog, the position vector may not be corrected for
            stellar aberration. In this case, to find the angular
            separation of the star and the limb of a planet, the vector
            from the observer to the planet should be corrected for
            light time but not stellar aberration.
 

      4) Obtain an uncorrected position vector derived directly from  
         data in an SPK file.
 
            Use &quot;NONE&quot;. 
 

      5) Use a geometric position