From: skybuckflying@gmail.com   
      
   On Friday, December 16, 2022 at 12:57:38 AM UTC+1, R Kym Horsell wrote:   
   > Skybuck Flying  wrote:   
   > > On Thursday, December 15, 2022 at 12:07:54 AM UTC+1, R Kym Horsell wrote:   
   > >> Skybuck Flying  wrote:   
   > >> > Hello,   
   > >> ...   
   > >> OK. I have saved that away to look throuh slowly.   
   > >> A first comment on something I saw on way through -- calculating   
   > >> the distance between 2 points on a sphere or almost-sphere is   
   > >> by a simple formula "great circle distance".   
   > > It is probably not accurate enough and has issues near the poles.   
   > Oh, sure. The earth is not a sphere. But why do you need to determine   
   > the actual "over the earth" distance to better than 1 part in 1000?   
   >   
   > I had guessed you might want to be able to tell someone at one location   
   > where in their sky an object might be that is now being seen at   
   > some other location. But that can be done well within say 1 degree --   
   > a finger width -- using the low-grade GPS co-ords the phone is sending   
   > out all the time. You dont even need the great circle distance for that --   
   > just the x,y and z of the 2 points.   
      
   Might as well go for max accuracy.   
      
   At least 1 meter accuracy and not strange pole issues....   
      
   Plus data sets do not assume a sphere but wgs84.   
      
   Bye,   
     Skybuck.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)