I'm an "on-my-own-free-time" arm-chair student of physics. Lol. So if this question is way off the mark my apologies. Feel free to let me know where I’m off base. Anyway... For me, a great visual example of the twin paradox was found at this site: http://www.phy.syr.edu/courses/modules/LIGHTCONE/LightClock/default.html (Thanks Janus it was your link posted on another thread I used to get there) So, the second to last AVI or RAM at the bottom of the page shows the twins or (A) and (B)s full journey within their own world lines travelling through 4d-spacetime. The twin (A) stays in his inertial frame and the twin (B) travels away from the first twin and then turns around. It was said that at the point of the turn it is revealed who has the preferred reference frame. So the paradox is resolved when the twin (B) turns around and returns to meet twin (A) Twin (B)s change of direction shows that he can no longer be considered to be in the preferred reference frame. He will age more slowly also the faster he goes. But my question is: When the twin (B) turns to return to twin (A) why can't it be said instead that twin (A) was the one doing the turning WRT to twin (B). Or a third possibility could be that they both share half the turn, if one can put it that way. So for the first half the trip twin (B)s clock runs slowly compared to twin(A) and for the second half of the trip twin (A)s clock runs slowly compared to twin (B)s. If they are doing a circular orbit around each other then perhaps the time dilation of both twins would just cancel out in real time. Sorry for the convoluted example but there you go. That’s my question. Is this possible? At the end of the trip both twins aged at the same rate? One can’t prove who was turning around whom and no one was discovered to be in the preferred inertial reference frame for the entire duration of the trip. Both reference frames during all turns or orbits equally cancel out each others time dilation. But time dilation still occurs as per usual. Sigh.. Hope that made some sense. Best Eon.