llowing values of 'abcorr' apply to the 
               &quot;reception&quot; case in which photons depart from the 
               target's location at the light-time corrected epoch 
               et-lt and *arrive* at the observer's location at `et': 
 
                  &quot;LT&quot;       Correct for one-way light time (also 
                             called &quot;planetary aberration&quot;) using a 
                             Newtonian formulation. This correction 
                             