From: fortunati.luigi@gmail.com   
      
   Luigi Fortunati giovedì 28/04/2022 alle ore 19:59:24 ha scritto:   
   > [[Mod. note -- The fundamental difference between the elevator and   
   > the Earth is that the Earth is a self-gravitating system -- different   
   > parts of the Earth have a non-trivial gravitational interaction with   
   > each other.  That means that (a) an inertial reference frame (IRF)   
   > on one side of the Earth (right next to the elevator), (b) an IRF at   
   > the center of mass of the Earth, and (c) an IRF on the other side of   
   > the Earth, are three DISTINCT IRFs.   
      
   If so, then there are not only 3 inertial reference frame but there are   
   infinite of them and they are all directed radially towards the center   
   of the Earth, right?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)