Mike; SR defines an inertial frame in motion as equivalent to a pseudo rest frame. When a light signal is sent outbound to reflect from a distant object and return, the observer expects the transit times out and back to be equal. That’s the basis for establishing the aos/los. You are not in agreement with the definitions. The relative speed is .6c with a gamma = 1/.8. left: This is the distortion from mixing frames, as in B2 interpreting light signals sent by B1. B2 moving toward A after reversal, intercepts the B1 signals earlier than B1 would have, thus perceiving A as closer. The A speed profile appears to change twice in returning to B. right: The clock rate correspondence of A to B, resulting from the left graphic. It's incorrect since A was an inertial frame and its clock rate was constant, B1 and B2 were both inertial frames, and their clock rates were constant. It shows a nonsensical speed profile with the A clock running 2x the rate of the B clock, while moving at the same speed! Please Register or Log in to view the hidden image!