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 Quote by Bjarne Right Now we assume the meter stick always is comparable the exact same for both A and B. Observer A and B will now in a certain period measure a photon traveling a certain distance (300,000 km). Both observers agrees that this is what really happen. Based on this observer A would say that the speed of light is exactly 300,000 km in one (of his) second. But observer B would say OK I agree the distance the photon was travelling is 300,000 km ... BUT I do not agree it took one second, - my clock shows it only took ˝ second, so here the speed of light is 600,00km/s Do you prefer that solution? Hmmm… So what we do next?
This is different from how Shapiro experiment was performed.
There is only one observer who is sending radar signals so that sometimes they are passing close to the Sun and sometimes far from the Sun. When you make a correction for time delay depending on signal's closest passing distance from the Sun you can consistently describe orbit of observed object (Venus).
In your case speed of light is always the same because proportion "m/s" does not change.

 Quote by Bjarne I have never heard about Shapiro time delay. If it really is certain and confirmed knowledge, and not something only at a test level, - yes we have a one more problem/challenge..