XPost: sci.physics.relativity   
   From: relativity@paulba.no   
      
   Den 14.09.2025 12:14, skrev Maciej Woźniak:   
   >> Den 13.09.2025 22:23, skrev Maciej Woźniak:   
   >>> On 9/13/2025 9:37 PM, Paul B. Andersen wrote:   
   >>>>   
   >>>> Our two main sequence stars both existed in the same universe   
   >>>> 10000 years ago   
      
   >>> Have you ever heard about an idiot babbling that   
   >>> what was 1000 years ago for you may be easily   
   >>> 300 years ago for someone else?   
      
   > Idiotic, isn't it?   
      
   Indeed it is.   
      
   You claim that according to Einstein:   
   "what was 1000 years ago for you may be easily   
     300 years ago for someone else."   
      
   This statement is so ambiguous that it isn't even wrong,   
   it is meaningless. It depends on the what "what" refers to.   
      
   In the context you have used it, "what" is:   
   "The light you see in the telescope was emitted from the star"   
      
   So the statement becomes:   
   The light you see in the telescope was emitted from the star   
   1000 years ago for you, but the light someone else see in   
   the telescope may be emitted from the same star  300 years ago for   
   someone else.   
      
   Idiotic, isn't it?   
      
   But if "What" is:'   
   "The proper time measured between two events"   
   then the statement becomes:   
      
   If you measure the proper time between two events to be   
   1000 years, someone else may measure the proper time between   
   the same two events to be 300 years.   
      
   This is a true statement.   
   But to make this happen, "you" and "someone else" would have to   
   travel between the events along very different paths in spacetime,   
   and accelerations and speeds would have to be of magnitudes   
   which are impossible to achieve in the real world.   
      
   But this experiment is performed in the real world,   
   See:   
   https://paulba.no/paper/Hafele_Keating.pdf   
      
   It is really two experiment:   
      
   Experiment 1:   
   Clock A and clock B are co-located on the ground.   
   Clock A stays stationary on the ground while clock B is put on   
   an aeroplane and flown around the Earth in the westwards direction.   
   When the clocks again are co-located the clocks are compared.   
   Result:   
   Proper time of clock B is 273 ns more than the proper time of clock A-   
      
   Experiment 2:   
   Clock A and clock C are co-located on the ground.   
   Clock A stays stationary on the ground while clock C is put on   
   an aeroplane and flown around the Earth in the eastwards direction.   
   When the clocks again are co-located the clocks are compared.   
   Result:   
   Proper time of clock C is 59 ns less than the proper time of clock A-   
      
   You can see the principle of the calculation here:   
   (Well, not you, but potential lurkers can)   
   https://paulba.no/pdf/H&K_like.pdf   
      
      
   Maciej, now you can demonstrate how smart you are by calling   
   Hafele and Keating "brainwashed religious maniacs".   
      
   --   
   Paul   
      
   https://paulba.no/   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)