 from the
                target's location at the light-time corrected epoch
                et-lt and *arrive* at the observer's location at
                'et':

                   'LT'       Correct for one-way light time (also
                              called &quot;planetary aberration&quot;) using a
                              Newtonian formulation. This correction
                              yields the position of the target at the
                              moment it emitted photons arri