XPost: alt.windows7.general, alt.comp.os.windows-10   
   From: address@is.invalid   
      
   J.P. ,   
      
   First off, FYI, Paul has minimized his posting about the subject to the   
   Win10 group only.  If you're not there already it might be a good idea to   
   take a peek.   
      
   > If it _is_ light-source-at-centre, then the Y co-ordinate would just be   
   > the tangent of the latitude   
      
   Somewhere along the road I had a similar thought.   But why than do all the   
   formules I now have (four at the moment) all do a tan() and than wrap that   
   up in a log() ?    There must be something to it.   
      
   Regards,   
   Rudy Wieser   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)