From: nospam@de-ster.demon.nl   
      
   Tom Roberts  wrote:   
      
   > On 6/29/21 1:41 AM, J. J. Lodder wrote:   
   > > [...] The speed of light cannot 'really' be variable. [...]   
   >   
   > You make far too many assumptions to be reasonable.   
   >   
   > Certainly the (vacuum) speed of light COULD vary, it's just that in the   
   > world we inhabit, with current technology, it is observed to not vary   
   > significantly (when measured using standard clocks and rulers at rest in   
   > some locally inertial frame).   
      
   That's where you are mistaken.   
   There is no such thing as a god-given 'standard clock'   
   or 'standard ruler'.   
      
   > But it certainly is possible that in the   
   > future we will develop technology with greatly improved resolution and   
   > discover that it actually does vary in the world we inhabit.   
      
   A meaningless statement.   
   If variation is found we will have to discover (or decide!)   
   what it is that varies.   
   (speed?, rulers?, clocks?, all three?, some 'fundamental' 'constant'?)   
      
   > It is also possible we will never find it varies -- science is a JOURNEY,   
   > not a destination.   
      
   Empty ideology.   
   This is not a matter that can be settled   
   by means of naive empiricism,   
   by just 'measuring' the 'speed of light',   
      
   Jan   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)