On 19 June 2014 02:47, John Clark <[email protected]> wrote: > On Wed, Jun 18, 2014 at 10:01 AM, <[email protected]> wrote: > > > Time does not slow down when you go fast and is not affected by gravity. >> Clock speeds may be effected but not time. >> > > OK fine, but if it's not time then we're going to need a new word to > describe whatever it is that clocks actually measure, lets call it zime. I > would submit that we could not tell even in theory if time stayed the same > or sped up or slowed down or went sideways or even ceased to exist. But we > certainly notice zime! Therefore there is no way to know if time even > exists and given that it does absolutely positively nothing there is also > no reason to care if it does or not; but zime certainly exists and it does > a hell of a lot. There is nothing more important in our life than zime but > even if time exists it doesn't matter. > > I might just add, in case it isn't clear, that to say that "clocks" slow down is also to say that atomic vibrations and everything else slow down, including people's thoughts and perceptions. I should also mention that SR says this is a measurement effect while observers move at a constant speed relative to one another. It's only when they (or one of them) accelerates that you get a "twin paradox" where the overall elapsed time along one path through space-time is not equal to another one, even though they have the same start and end points.
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