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Originally posted by sir_chancealot
One of the "fundamental" principles of physics today is that the speed of light in a vacuum is a CONSTANT. Does anyone see what problems arise from having circular reasoning involved with the speed of light, as the OP has pointed out?
Let me help you out. If the speed of light in a vacuum changes, WE WILL NOT BE ABLE TO TELL. If you use the "bar of metal" standard for the length of a meter, then you would know. But if light slowed down to half (from an absolute perspective) the speed it once was, no one would know using the definition given, because both sides of the "equation" change in the same proportion.
Think about it.....