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Colin, my friend! I'm confused. First you quote me and then you address David? Is that correct? If so can you please answer the question I asked you in case you forgot? Thanks.
If you've managed to follow the argument, perhaps you could help me to find a clearer way to state things that would be easier for people to follow.
Huh?
"Now, because the planet is rotating eastwards, the light that goes east through the cable will obviously take longer to return to point X than the light that goes westwards (and this difference can be measured in real experiments)" Naah, don't think so. Let's see, what do we have experimentally? http://www.nobelprize.org/educational/physics/relativity/experiment-1.html ?
So what you define here is what I would call 'absolute motion', but relative what? Where is the gold standard? What we can define experimentally is a red, respectively, blue shift. We call that a equivalence to accelerations.
If the speed of light was different in different directions ......... since the speed of light is defined in terms of the permeability of free space.
So you're saying that any aether ...
... would have to change μ0 in different directions. Never thought of that, in fact never really thought of what physical properties an aether might need to have.