From: eaglesondouglas@gmail.com   
      
   On Wednesday, September 20, 2017 at 6:54:02 AM UTC-4, Luigi Fortunati wrote:   
   > The spaceship C is firm with respect to the star S distant 4 years-light.   
   >   
   > Be AB any diameter of the star.   
   >   
   > From A and B start two light rays arriving at the spaceship, forming the   
   > ABC triangle whose height then measures 4 light-years.   
   >   
   > Next to the spacecraft C passes spaceship D approaching gamma=4 to star   
   > S.   
   >   
   > For the contraction of the lengths, star S (for spaceship D) is only 1   
   > year-light distant and therefore the height of the ABD triangle measures   
   > only 1 year-light (instead of 4).   
   >   
   > Geometrically, the angle in D is 4 times larger than the angle in C.   
   >   
   > How is this all possible if the rays of light in the common point C e D   
   > are the same?   
   >   
   > --   
   > Credere e' piu' facile che pensare   
   > Believing is easier than thinking   
   > Luigi Fortunati   
      
   I am wondering it the question appears to propose   
   conservation of parallax. Except the concept does something disallowed   
   and defines the apparent angle D. Relative ray exists, the angles   
   are supposed to be different, a ray has no existence as a formal   
   event.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)