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Physics
Special and General Relativity
How to rule out that the speed of light was different in the past?
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[QUOTE="Vanadium 50, post: 6848135, member: 110252"] α is absolutely not the speed of light morphed into a dimensionless form. Insofar as it is anything at all besides α, it is the charge of the electron morphed into a dimensionless form. c is a factor that comes about because we historically measured time in seconds and length in meters. (And is equal to a dimensionless 1 in sane units). It's a conversion factor, like the dozen. No more, no less. It tells us about spacetime, not electromagnetism. [/QUOTE]
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Physics
Special and General Relativity
How to rule out that the speed of light was different in the past?
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