This is a very simple scenario. Given: Earth (E) t=0, x=0 ,and a station (Stn.) at rest wrt (E) at 100 ls,.....t=0, x=100 And a ship S which instantaneously accelerates to 0.8c at t=0, x=0 and t'=0. At t,t'=0 all three systems begin sending simple quantitative sequential time signals at one second proper time intervals. 1,2,3,4,5,........... Solely on velocity calculations we can assume that the ship arrives at Stn at t=125 and ship time t'=75 At this time we can assume that the ship will have received 1 -->125 signals from the Stn and likewise the Stn will have received signals 1-->75 from the ship. In the Stn frame they will have received signals 1-->25 from E and the assumption would be that a further 100 signals would be spread out in space on the way. The ship will also have to have received the same number of of E signals at this point 1-->25. QUESTION #1): At what proper ship time did the ship receive signal number 1 from the Stn.??? Back on Earth t= 125 ,,,they will also have received signals 1--> 25 from the Stn and I would assume signals 1-->15 from the ship. #2) Is there any calculation that would indicate E receiving a different number from the Ship??? So it would appear that given intelligence on Earth they would calculate that at this time, if the Ship is on schedule, it is colocated with the Stn. This would infer that based on this distance in their frame, that they had received 20% of the signals sent by S, the other 80% being spread out in transit. From this it follows that 20% of their elapsed time = 25 and if they received 13 signals in this time the relationship is 25/15 =1.6666667 which is of course the dilation factor. On the Ship colocated with the Stn this same calculation could apply. That they had received 20% of the E signals = 25 and 20% of their elapsed proper time is 15 sec. SO it would appear that rationally, both frames could calculate the same non-reciprocal dilation factor. #3) Is there any principle that would indicate any of these premises would not apply?? #4) Would any of the locations have received a different set of signals???