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| Thus we observe that an I-sig in one frame, or simultaneous actions in one frame, are not seen as simultaneous in another frame. This recalls Einstein’s train which gets struck by lightning at both ends. A person in the middle of the train notes that light from both strikes reach him at the same time, and so he concludes the strikes were simultaneous. But, someone on the station platform sees the bolt striking the rear of the train first. | ||||||||||||||||||||
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