From: mlfasf@comcast.net   
      
   On 3/16/22 1:22 AM, Luigi Fortunati wrote:   
   >   
   > This is why I ask: is it possible to calculate how many turns the   
   > traveler twin will have * seen * make from the Earth around the Sun on   
   > the spacecraft's telescope, after its 4-year journey, before starting to   
   > brake?   
   >   
      
   Yes.  I've already shown how the traveling twin (he) can determine the   
   current age of the home twin (her) at any instant in his life.  And, if   
   you know what her mom says the position of the earth in its orbit around   
   the sun was when her daughter (the home twin) was born, then that   
   establishes a one-to-one correspondence between the home twin's age and   
   the position of the earth in its orbit about the sun, and the number of   
   complete orbits it has made since she was born.  So that allows the   
   traveling twin to determine the position of the earth in its orbit, and   
   the number of completed orbits since the home twin was born, at each   
   each instant in the life of the traveler (he), according to him.  But   
   I'm not at all interested in that ... I just want to know what he   
   concludes about her current age at each instant of his life.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)