From: tjroberts137@sbcglobal.net   
      
   On 4/3/22 12:13 PM, Mike Fontenot wrote:   
   > On 4/2/22 11:36 AM, (I) Mike Fontenot wrote:   
   >> So there you have it.  That's the calculation that defines "NOW"   
   >> for the AO and all of the HF's, and makes simultaneity at a   
   >> distance a meaningful concept for them.  Simultaneity at a   
   >> distance is not a choice.   
      
   Yes, simultaneity at a distance is a choice. Your approach is   
   outrageously unphysical -- maneuvering the ship causes unphysical   
   changes in the "age" ascribed to a distant friend.   
      
   > But what does the above say about the current age of the home twin   
   > (she), according to the traveling twin (he), for each instant in his   
   >  life on his trip?  The answer is that the above equations give the   
   > same results as the Co-Moving-Inertial-Frames (CMIF) simultaneity   
   > method. That is very fortuitous, because the CMIF method is   
   > relatively easy to use.  The value of the array of clocks discussed   
   > above (which establish a "NOW" moment for the accelerating observer   
   > that extends throughout all space) is that they GUARANTEE that the   
   > CMIF results are fully meaningful to the traveler, and that the CMIF   
   > method is the ONLY correct simultaneity method for him.   
      
   As I keep pointing out and you keep ignoring, this is outrageously   
   unphysical. If the traveling twin maneuvers his spaceship, the "age" he   
   ascribes to a distant friend can change very rapidly. No sensible person   
   would believe that local actions he takes can "change" his friend's age.   
      
   > He has no other choice.   
      
   Not at all. The traveling twin can recognize that his current time is   
   completely divorced from that of his friend far away. If the age of his   
   friend is important to him, he would keep track of his motion relative   
   to the ICRF, knowing that regardless of his motion or location, the   
   current time of the ICRF can be used to calculate the current age of his   
   friend (for all practical purposes his friend on earth is at rest in   
   the ICRF). Any sensible astronaut would do that.   
      
   Tom Roberts   
      
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