Wow. So elegantly simple explanation, thanks John! On November 27, 2015 2:54:51 PM CST, John Miles <j...@miles.io> wrote: >So, here's how I finally grokked this stuff. c, the speed of light in >a vacuum, is often spoken of as a "speed limit" that nothing can ever >exceed. That's a bad way to put it, and people who have expressed it >that way in popular science writing for 100 years should feel bad. > >Instead, the way to visualize relativity is to realize that c is the >*only* speed at which anything can travel. You are always moving at >300,000,000 meters per second, whether you want to or not. But you're >doing it through all four dimensions including time. If you choose to >remain stationary in (x,y,z), then all of your velocity is in the t >direction. If you move through space at 100,000,000 meters per second >in space, then your velocity in the t direction is 283,000,000 meters >per second (because sqrt(100E6^2 + 283E6^2) = 300E6.) > >It doesn't make sense to speak of moving a certain number of "meters" >through time, so your location in time itself is what has to change. >You won't perceive any drift in your personal timebase when you move in >space, any more than you will perceive a change in your location >relative to yourself. ("No matter where you go, there you are.") But >an independent observer will see a person who's moving at 100,000,000 >meters per second in x,y,z and 283,000,000 meters per second in t. >They see you moving in space, in the form of a location change, and >they also see you moving in time, in the form of a disagreement between >their perception of elapsed time and your own. > >Likewise, if you spend all of your velocity allowance in (x,y,z), your >t component is necessarily zero. Among other inconvenient effects that >occur at dt/dt=0, you won't get any closer to your destination, even >though your own watch is still ticking normally. Particles moving near >c experience this effect from their point of view, even while we watch >them smash into their targets at unimaginable speeds. > >This is special relativity in action. The insight behind general >relativity is twofold: 1) movement caused by the acceleration of >gravity is indistinguishable from movement caused by anything else; and >2) you don't even have to move, just feel the acceleration. That >second part was what really baked peoples' noodles. It is what's >responsible for the disagreement between the two 5071As. > >-- john, KE5FX >Miles Design LLC > >> Hi Mike, >> >> The time rate does remain the same - at the device. The problem is >the idea >> that it is the hyperfine transitions that determine the time... > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there.
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