From: tjroberts137@sbcglobal.net   
      
   On 8/1/19 2:33 PM, Phillip Helbig (undress to reply) wrote:   
   > What matters in the twin paradox is who has the strongest   
   > acceleration.   
      
   No. What matters is who has the shortest path through spacetime.   
      
   It is easy to set up a twin scenario in which two twins orbit a mass,   
   one in circular orbit and one in a highly elliptical orbit, such that   
   they meet periodically. Both have zero proper acceleration. It can be   
   arranged so either one has the larger elapsed proper time between meetings.   
      
   One can also set up a twin scenario using clocks on the rims of rotating   
   disks, with the disks' centers at rest in some inertial frame, arranged   
   so they meet periodically. By varying the diameter and rotation rate of   
   the disks, one can arrange for the clock with the larger proper   
   acceleration to have either larger or smaller elapsed proper time   
   between meetings. In this case, of course, it is the speed of the clock   
   that matters, not its acceleration (both relative to the inertial frame).   
      
   Tom Roberts   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)