Sorry my error. Moot point. Being born in a system that is already dilated is the same as being on the system when it accelerated and dilated. The tick rate has already been established by the energy change when the acceleration occured. Hell it could be veloicty as a resuslt of the Big Bang, it woudn't matter. It has accelerated some time in the past so as to have a relative velocity. OK. Are you saying reciprocity is impossible. Yes or No.? I understadn simultaneity. It is just that simultaneity does not resolve thie issue. Relativists attempt to use it to mask the problem and create confusion but simultaneity shift does not account for any accumulated time dialation upon comparison in a common frame. It is only time dilation when compared in a common frame that constitutes actual time shift. All else is perception or illusion. I'll have another read but I doubt your claims have anything to do with actual time dialtion. Before reading I can tell you just from what you have written that indeed events that ARE simultaneous (i.e. measured from a center point in a common frame) may not APPEAR simultaneous in another frame but that does not make them not simultaneous physically. All physics occur in the local proper time and frame. All else is perception. The perception of not being simultaneous does not change the fact of simultaneity. The fact of simultaniety is a function of the frame they occur in. There you have made your problem clear. You choose to believe that simultaneity shift due to different frames is physical reality. It isn't.