From: nobody@invalid.invalid   
      
   Am 06.10.2017 um 18:26 schrieb Luigi Fortunati:   
   > As it goes away, any object on Earth appears to us ever smaller, and as   
   > it approaches it seems bigger.   
   >   
   > Is this inverse proportionality between the distance of a known object   
   > and its apparent size (theoretically) allow in the future to   
   > immediately know a distance simply by measuring one its apparent size   
   > without having to synchronize the clocks and without having to wait for   
   > a return signal?   
   >   
   No chance. You cannot distinguish an object of size S in a distance D   
   approaching with velocity v from an object of size 2*S in distance 2*D   
   approaching with velocity 2*v.   
      
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