From: fortunati.luigi@gmail.com   
      
   Sylvia Else alle ore 06:27:39 del 24/07/2017 ha scritto:   
   >> Before the departure, the two brothers agree that from the Earth,   
   >> every 10 years, the earth twin would send a flash to the spaceship.   
   >>   
   >>    The traveling twin starts and half of his trip (after 5 years of his)   
   >> arrives next to the distant star around which he will turn to go back.   
   >>       For him, due to temporal dilation, on Earth, where time runs 8 times   
   >> slower, it has not even been a year and therefore it will have to pass   
   >> more than 9 earthy years before the first lightning starts.   
   >>       Then the spaceship rotates around the star and prepares for the last   
   >> 5 years of the return trip.   
   >>   
   >>    If just before the turnaround, they were missing (on Earth) more than   
   >> 9 years after the first flash started, how many years are missing now   
   >> that the return has just started?   
   >>   
   >   
   > I don't know what you mean by "missing". The travelling twin will see   
   > all 8 flashes (the last being at the moment he arrives back home) on the   
   > journey back. None get lost.   
   >   
   > Sylvia.   
      
    The traveling twin can see the first flash only if it is already "started".   
      
    Well, in the reference of the traveling twin, when "part" the first flash?   
      
    I repeat: "Part" does not "arrival".   
      
   --   
   Luigi Fortunati   
      
   Credere e' piu' facile che pensare   
   Believing is easier than thinking   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)