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Brian Greene does have a good discussion about a light clock but earlier he describes starting on page 34 a story about the secretary-general of the UN attempting to resolve conflicts between warring nations by having their presidents simultaneously sign peace accords when a flash of light in the center of their table is viewed by each president sitting at opposite ends of the table. It doesn't work when the signing takes place on a moving train because the residents of the two nations on the ground outside the moving train can see that the signings do not take place simultaneously.JesseM said:Brian Greene has a good discussion of the light clock on pages 37-41 of his book The Elegant Universe (if you read this section on google books you may want to start on page 28 where he first outlines the basic principles of relativity).
My question: what is it that Brian Greene is claiming that the residents actually see that convinces them that the signings are not simultaneous?