From: heathjohn2@gmail.com   
      
   On Tuesday, August 8, 2017 at 9:37:27 AM UTC-4, Tom Roberts wrote:   
   > On 8/8/17 8/8/17   2:35 AM, John Heath wrote:   
   > > The direction of physics is set by measurements made.   
   >   
   > Yes. And moreso by specific experiments.   
   >   
   > > This being said the twin paradox has been measured. The results of   
   > > these measurements is a bit of a surprise. If the traveling twin   
   > > take a train from New York to Sam Francisco , west , his clock will   
   > > run faster while traveling.   
   >   
   > Yes, though the actual experiment used an airplane, not a train.   
   >   
   > > Your twin paradox just got a lot more   
   > > complicated.   
   >   
   > This is not "more complicated" at all, it is simply due to the rotation of   
   the   
   > earth. Here neither "twin" is inertial, and at mid-latitudes a westbound   
   > airplane (or train) moves slower relative to the earth-centered inertial   
   frame   
   > (ECI) than a clock at rest on the surface. It is speed relative to an   
   inertial   
   > frame which matters, not speed relative to a rotating frame (such as the   
   earth   
   > surface).   
   >   
   > Hafele and Keating's measurements are fully consistent with the predictions   
   of   
   > GR (altitude in earth's gravity matters, too).   
   >   
   > Tom Roberts   
      
      
      
   It has to be a train not a plane as the numbers quoted are RS - GR   
   effects west +96 ns east -180 ns.   
      
   The SR effects - GR say the traveling west bound twin's clock was   
   running faster not slower.   
      
   The earth's equator is rotating at 1000 MPH east and the twin 500   
   MPH west so it would make sense that the twins clock will run faster   
   as in the big picture he is moving 500 MPH slower.   
      
   It would make sense if there was a preferred FoR. I am okay with a   
   preferred FoR. Do not mean to speak your mind but I believe you are   
   not okay with a preferred FoR. Is there a way to have a moving clock   
   run faster without a preferred FoR ?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)