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Old April 1 2013, 10:02 PM   #11
gturner
Admiral
 
Location: Kentucky
Re: Speed of light is not perfectly constant in vacuum!

^ Well, let me crunch some numbers.

If there was a galaxy moving in translation at 300 km/sec (3.0e5 m/sec, or 0.1% of C) then the lead angle for the light rays should be asin(0.001) or 0.057295 degrees, which is 206.264 arc seconds. If half of the photons actually travelled at 299e6 m/sec their lead angle would be 206.954 arc seconds, a 0.69 arc second difference, which should be observable with current telescopes, a bit like gravitational lensing.

I don't know if that's a valid way to look at it, but if it is it would at least set a limit on how big the effect could be.
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