- determining if great circle segments intersect

[Norman Vine]

On Mar 10, 2005, at 1:24 PM, Joseph Bussell wrote:

> I have lived and breathed Williams' Aviation Formulary ever since
> TrafficDodger was discontinued and I was assigned to our aircraft
> routing tool (WARP).  He does have some of the juice, but certain
> cases appear to slip through the cracks of his algorithm (or my
> interpretation of it).

I believe the formulary has everything you need
but perhaps you will find this more illuminating :-)

http://nsidc.org/data/tools/spheres/GCAIntersect.html

Norman