Reply to post: Re: c is calculable

Three certainties in life: Death, taxes and the speed of light – wait no, maybe not that last one

Mage Silver badge

Re: c is calculable

"It's widely understood that relativity claims that c is a constant"

Not just Relativity. It comes out as a constant in Maxwell's equations, for a vacuum. A medium allows for slower propagation of light, radio, magnetism, electric fields. A coaxial cable slows radio waves, like fibres slow light. Or PCB traces on a multilayer board slow the signals.

Einstein was understandably pleased when he studied Maxwell's work.

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