From: relativity@paulba.no   
      
   Den 13.10.2025 07:59, skrev Thomas Heger:   
   >   
   > I meant that time is always an interval, while Einstein thought about   
   > time as linear and countable.   
      
   So according to Thomas Heger it is impossible to say what   
   the time is now. :-D   
      
   What the display on a 'clock' shows is a 'point in time'.   
      
   I can say that the 'time' now is October 13, 2025, 14:34:32 CET   
   That's 'a point in time'.   
      
   If I left my home at   t1 = October 13, 2025, 7:05:10 CET   
   and arrived at work at t2 = October 13, 2025, 7:59:50 CET   
   Then I can say that the 'time' I used to walk to work today   
   was 54 minutes and 40 seconds.  (Δt = t2 - t1)   
   That's a duration (or 'interval').   
      
   So "time" can be both 'a point in time' and a duration.   
      
   > But usually we use some starting point as reference, while often that   
   > isn't mentioned.   
      
   The 'starting point' is obviously 'the point in time' at   
   the beginning of the duration in question.   
      
   If we are only interested in durations, we may choose to   
   use a clock we can set to zero at any time.   
      
      
   --   
   Paul   
      
   https://paulba.no/   
      
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