Gene wrotethe
line normal to the tangent of the ellipsoid and the axis of rotation),
and the angles used in the parametric formulas representing an
ellipse.

I got a little lost in all that, Gene, but I figure it all amounts to about
half a mile (statute) in a 1000K flight. Anyone that doesn't plan their long
flight with at least a 5 mile cushion, is asking for trouble.
JJ Sinclair