From: litewave99@gmail.com   
      
   On Friday, March 23, 2018 at 9:32:16 PM UTC+1, myriadsma...@yahoo.com wrote:   
   > "Generally, you cannot have a straight line in a curved surface (except   
   certain cases, for example a vertical straight line in the surface of a   
   vertical cylinder). Our space is usually curved only a little, so what we call   
   straight lines are not    
   perfectly straight but their deviation from a straight line is negligible for   
   practical purposes."   
   >    
   > Causing no end of problems delivering ordnance in the 17th century, and   
   leading to the discovery of the calculus by both Newton and Leibniz   
   independently, or so the story goes.   
   >    
   > Vive le difference.   
      
   I didn't mean curvature of the surface of the Earth but curvature of our   
   space. That was discovered only in 20th century by Einstein. Our space   
   curvature is not ignored in GPS navigation for cars because that would make a   
   difference on the order of tens    
   of meters, or so I've heard.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)