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Jun8-04, 12:04 PM
P: 220
SR Simultaneous Lines Drawn in the Sand

Einstein reasons thusly:

(1) If an observer is exactly between two lights when they emit pulses simultaneously (according to the observer), then
(2) the pulses from both sources will be detected (received) by the observer simultaneously.
are you sure that's what he's reasoning? because he would have to assume light travels instantaneously in order for that to be true.

as another observation, if a person arrives AT the midpoint M at the exact time to be hit by photons from A and B, NO MATTER what direction speed acceleration, we can safely assume the photons were emitted from the sources simultaneously, even if they were not calibrated to do so.

but this is simply an observation of speeds and distance midpoints known by any elementary school student