ar
   system barycenter. Relativistic effects such as light bending and
   gravitational delay are not accounted for in the light time
   correction performed by this routine.
 
   Stellar aberration
   ------------------

   The velocity of the observer also affects the apparent location 
   of a target:  photons arriving at the observer are subject to a 
   &quot;raindrop effect&quot; whereby their velocity relative to the observer 
   is, using a Newtonian approximation, the photons' velocity 
   relativ