From: nospam@de-ster.demon.nl   
      
   Luigi Fortunati  wrote:   
      
   > Richard Livingston martedì 24/05/2022 alle ore 18:05:03 ha scritto:   
   >>> For example, if I put two clocks at the maximum distance on the floor,   
   >>> they remain synchronized and, therefore, horizontally there is no   
   >>> acceleration (there is quiet).   
   >>>   
   >>> If, on the other hand, I put a clock on the floor and one on the   
   >>> ceiling, they don't stay synchronized and, therefore, there is   
   >>> acceleration vertically (there is no quiet).   
   >>   
   >> According to GR, yes.   
   >>   
   >> Rich L.   
   >   
   > In the free-falling elevator, does the clock on the floor stay   
   > synchronized with the clock on its ceiling?   
   >   
   > Luigi   
   >   
   > [[Mod. note -- Yes, apart from tidal effects.  -- jt]]   
      
   You may note that with today's clock accuracies   
   these 'tidal effects' will be observable in an elevator-sized box,   
   such as the ISS for example.   
   (if it would be practical to bring those clocks up there)   
      
   So No, if you measure accurately enough,   
   (but still not a measurement of acceleration)   
      
   Jan   
      
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