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Mar 7, 2017 at 2:16 comment added JMLCarter I meant what does A observer of B during the journey, assuming for a moment he can observe him. (I posted my own answer now.)
Mar 7, 2017 at 2:11 comment added Selene Routley @JMLCarter I'm not sure I quite grasp your comment. Do you mean whether one relate this from $B$ and $C$'s perspective, or perhaps you mean something like WillO's answer?
Mar 7, 2017 at 1:46 comment added JMLCarter It would be satisfying to also be able to resolve this from a co-ordinate frame perspective (not just with proper time or in a frame of reference that provides symmetry) because the co-ordinate frame of A describes what is experienced by an observer A.
Mar 7, 2017 at 1:16 history edited Selene Routley CC BY-SA 3.0
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Mar 7, 2017 at 1:09 history answered Selene Routley CC BY-SA 3.0