In the train example that supposedly shows the relativity of simultaneity, why, in the frame of the observer on the ground, the "midpoint" of the train in the train's frame is still the midpoint?(adsbygoogle = window.adsbygoogle || []).push({});

Does it have anything to do with Lorentz contraction? If so, there might be some circular reasoning here as Lorentz contraction is usually later than relativity of simultaneity in a textbook.

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# Question about relativity of simultaneity

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