e to the solar system barycenter minus the velocity of the 
   observer relative to the solar system barycenter.  This effect is 
   called &quot;stellar aberration.&quot;  Stellar aberration is independent 
   of the velocity of the target.  The stellar aberration formula 
   used by this routine does not include (the much smaller)
   relativistic effects.
 
   Stellar aberration corrections are applied after light time 
   corrections:  the light time corrected target position vector is  
   used as an in