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The esteemed Crank o' the Day for 2026 May 06:
Speed of Light as a Function of Time
2000 Jul 27
... relativity
. electromagnetism
...
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"The Hubble Parameter (Constant) has historically been interpreted as a distance measure for an expanding universe. With this interpretation, red shift of distant objects is proportional to distance. Some objects we can see are moving at rates approaching the speed of light. The Hubble Parameter could be interpreted as a measure of the rate at which the speed of light (c) is changing with time. Then, the amount of red shift of an object is related to c at the time of emission. Distant objects are not constrained to be moving at any particular velocity. The universe is expanding with respect to the speed of light."
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