Divide c by g and you get a length of time: 353.8 days. I shall dub it the "Einsteinian year".
Mr. Newton sits on a spaceship with no windows and feels it undergo 1g acceleration. He waits 354 days and concludes two things:
* He must now be traveling at the speed of light.
* 354 days have elapsed.
Both of these conclusions are wrong, sort of.
Does the Einsteinian year have any physical significance?
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