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1) Consider that one way light speed is anisotropic.
2) Use the Einstein method to synchronize all the watches by the watch located at (x,y,z)=(0,0,0).
Now, all the watches are synchronized by the watch at (0,0,0) but they are not necessarily synchronized with each-other (Consider watches that are not in one line). This means that the transitivity condition is not met by the synchronization. So the synchronization is not an equivalence relation. If so, the one-way light-speed is an observable quantity regardless of how we synchronize watches. Perhaps you are not agree with me, but could you spare me what I am missing? Or do you also want to accept that one way light speed is a measurable quantity?
2) Use the Einstein method to synchronize all the watches by the watch located at (x,y,z)=(0,0,0).
Now, all the watches are synchronized by the watch at (0,0,0) but they are not necessarily synchronized with each-other (Consider watches that are not in one line). This means that the transitivity condition is not met by the synchronization. So the synchronization is not an equivalence relation. If so, the one-way light-speed is an observable quantity regardless of how we synchronize watches. Perhaps you are not agree with me, but could you spare me what I am missing? Or do you also want to accept that one way light speed is a measurable quantity?