ived directly from
         data in an SPK file.

            Use 'NONE'.


      5) Use a geometric position vector as a low-accuracy estimate
         of the apparent position for an application where execution
         speed is critical.

            Use 'NONE'.


      6) While this routine cannot perform the relativistic
         aberration corrections required to compute positions
         with the highest possible accuracy, it can supply the
         geometric positions required as inputs to these co