XPost: sci.math   
   From: nospam@de-ster.demon.nl   
      
   Thomas 'PointedEars' Lahn  wrote:   
      
   > Paul B. Andersen wrote:   
   > > Den 22.11.2025 20:19, skrev Thomas 'PointedEars' Lahn:   
   > >> Scot Deyanov wrote:   
   > >>> Thomas 'PointedEars' Lahn wrote:   
   > >>>> A manipulated clock is not a clock.   
   > >>>>   
   > >>>> When we say that time is what is measured with a clock we mean a device   
   > >>>> that is not manipulated, that merely follows Nature.   
   > >>> no shit sherlock, once that manipulation is done, that clock is a clock   
   > >>> like everybody clock   
   > >> Which part of "_not_ manipulated" did you not understand?   
   > >   
   > > It is however common to call the manipulated clock   
   > > in a GPS satellite - a clock.   
   >   
   > The satellite's clock is not manipulated; never has been.   
      
   So you are clueless about that too.   
   You really shouldn't make such categorical statements   
   about things you know very litttle about.   
   FYI, Satellite GPS clocks are steered to remain in sync   
   with the master GPS clock at USNO.   
   (would have to look up the currently allowed tolerance)   
      
   This by itself is not really necessary,   
   but it is highly convenient to do so.   
      
   For understanding: Compare it with your grandfather clock at home.   
   You could let it run free, and say that tomorrow at noon   
   it will be off by 3h37m12s at noon tomorrow,   
   drifting by +7 seconds a day.   
   You will still know its time perfectly at all times,   
   but it is really more convenient to give it a small push occasionally   
   to make it indicate 12:00:00 within a few seconds of true noon,   
      
   Jan   
      
   FYA, an example of steering.   
   The Big Ben clock in London has been kept in sync with true time   
   (as taken from Greenwich Observatory)   
   by means of a pile of pennies put on the pendulum weight,   
   ever since it was put into motion about 150 years ago.   
   If it is a second fast the caretaker removes a penny,   
   if slow they put on another one.   
   Of course this steering does not mean that Big Ben does not move   
   in accordance with Newtonian mechanics.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)