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The problem I am having is understanding how such an interpretation could be considered true in the following scenario. Consider 4 spaceships named ShortnegX, LongnegX, ShortposX and LongposX. They are all together and synchronise their clocks with one another and then at t=1 depart. ShortnegX and LongnegX quickly accelerating to a velocity of -v in the -x direction, which ShortposX and LongposX also undergo the same acceleration only in the +x direction and they accelerate to a velocity of +v. At a distance of 1/2x ShortnegX and ShortPosX both decelerate and the accelerate again in the opposite direction heading back to the start position at a velocity of +v and -v respectively. LongnegX and LongposX continue until a distance of x from the starting point has been reached before they quickly decelerate and then accelerate in the opposite direction and head back to the starting point in the same way as ShortnegX and ShortposX had done.

The problem I have with the idea of relative truth here is that as I understand it the relative truth for ShortnegX for example would be that where the ships had been moving at a constant velocity the clock (both on the outward journey and on the inward journey) on ShortposX had been "ticking" slower than its own, and so should be indicating less time had passed than its own when they meet up. But its apparent relative truth would be shown to be wrong when they meet up. The same with ShortposX's relative truth regarding the clocks of ShortnegX. The same with LongnegX regarding the ticking of the LongposX's clock, though here the time difference would be expected to be even bigger than that expected by ShortnegX. Yet it too would be shown to be wrong when they met up. I find it hard to imagine that the accelerations and decelerations could explain it, as they would be the same for both LongnegX and ShortnegX and also the same for LongposX and ShortposX, and yet the differences in time that would needed to be adjusted for LongnegX's relative truth, and ShortnegX's relative truth would be different.

I was wondering if anyone here could explain to me where I have gone wrong in my assessment if indeed I have.