mputations.

            Use 'NONE', then apply relativistic aberration
            corrections (not available in the SPICE Toolkit).


   Below, we discuss in more detail how the aberration corrections
   applied by this routine are computed.

      Geometric case
      ==============

      spkezr_c begins by computing the geometric position T(et) of the
      target body relative to the solar system barycenter (SSB).
      Subtracting the geometric position of the observer O(et) gives
      the geometric