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Originally Posted by Metricyard
Throw in a variable speed of light, and you have no way to measure, well, anything. If you can't have at least one constant, there is no way you're going to preform any meaningful tests.
Maybe that's the whole point of a variable G, mass, and light? It's nice to provide a hypothesis that's not measurable. You can't prove or disprove it.
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We've gone from yards and pounds to kilograms and meters. Then we did one better, to variable 'Time and lengths' in Relativity. :^o
Why should variable G or c be so difficult? Just use the math based on which relative perspective you wish to observe and measure, from that perspective you derive the units relative to what you are observing, the units there. Typically, our measures are all Earth based, well except for "Star date 'seven thousand four hundred and'...", which may be star based. We could discover units that are universal, and yet allow for variables depending upon observer's location, which is what Relativity was supposed to be. Take out variable time and lengths and replace it with variable gravity and lightspeed, and I suspect you're closer to how the universe works.