This allows either observer to make the transformation to the other frame, in order for the results to be consistent in the other frame, but it does not change the relativity of simultaneity.

Originally Posted by space at the centre But here we do have a problem, for your example is impossible! For the simple reason that the light from the bulb is now travelling at c+v toward the back of the carriage and c-v towards the front; and as we all know light must travel at c

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