From: heathjohn2@gmail.com   
      
   On Sunday, August 6, 2017 at 1:20:56 PM UTC-4, LuigiFortunati wrote:   
   > John Heath alle ore 18:03:27 del 05/08/2017 ha scritto:   
   > > What if T and S move and the vacationing twin stands still. Now it is   
   > > all backwards with T and S 1 year older and the vacationing twin 79   
   > > years older. Hmmm ?   
   >   
   >   It's the acceleration that makes the difference.   
   > =3DA0=3DA0   
   > =3DA0=3DA0Regardless of what happens in the next five years, at the end o=   
   f   
   > acceleration, the distance of nearly 40 years-light has decreased to   
   > almost 5 years-light.   
   > =3DA0=3DA0   
   > =3DA0=3DA0If the space has contracted abruptly, time must have expanded   
   > abruptly.   
   > =3DA0=3DA0   
   > =3DA0=3DA0But (I repeat) the sudden change is not due to uniform motion b=   
   ut   
   > acceleration.   
   >   
   > --   
   > Luigi Fortunati   
   >   
   > Credere e' piu' facile che pensare   
   > Believing is easier than thinking   
      
   The direction of physics is set by measurements made. These   
   measurements then lead to speculation then a theory that will spit   
   out a math model to make predictions that are consistent with the   
   measurements made. Measurements must always lead the way to truth.   
   If not it would be the tail waging the dog.   
      
   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.  I repeat his clock will run faster not   
   slower while the twin is moving towards San Francisco. This is not   
   a theory nor a calculation. This is a measurement made so there is   
   no wiggle room to avoid it. Your twin paradox just got a lot more   
   complicated.   
      
   The measurements made that say the west bound twin's clock will run   
   faster can be found at Wikipedia.   
      
      
   https://en.wikipedia.org/wiki/Hafele%E2%80%93Keating_experiment   
      
   The hard numbers in nanoseconds for a twin speed of 500 MPH are   
      
   eastward 		=E2=88=92184 =C2=B118 =09   
   westward 		+96 =C2=B110   
      
   --- SoupGate-Win32 v1.05   
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