From: fortunati.luigi@gmail.com   
      
   Stefan Ram mercoledì 07/09/2022 alle ore 15:41:17 ha scritto:   
   >   Richard wrote about two points in /space/.   
   >   
   >   In GR, a geodesic usually is a curve in /space-time/.   
   >   
   >   It's points are not (x, y, z), but (t, x, y, z).   
   >   One should not think of its end points as being two points in space!   
      
   Okay, let's talk about two events in spacetime.   
      
   Event A is the lift's departure from point A and event B is the lift's   
   arrival at point B.   
      
   Why does the elevator (when it starts) go down (i.e. it goes from event   
   A to event B) and doesn't go up (where event B is not there)?   
      
   >   A geodesic has no direction by itself.   
      
   On this I absolutely agree, however the elevator of my animation   
   https://www.geogebra.org/m/zdevssyz   
   it goes only and always in one direction and never in the other, why?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)