John,

Well, because he used a just "plane geometry" in his unique derivation.
No calculus, etc. I had heard that there might be a problem in the approach
that he used. Before I really got into it, I wanted to know if there really
was a problem.

Cheers,
Don W



"John Zinni" wrote in message
.. .
"Donald Wilgus" wrote in message
. com...
Has anyone read Feynman's "lost lecture" where he uses "plane
geometry"
only to prove elliptical orbits of planets. And if so is there a hole
in
his presentation.

Cheers,
Don W

Hi Don

Why would there be a hole in his presentation?

The derivation of elliptic orbits based on Euclidian Geometry has been
well
tested over the 300 years since Newton fist preformed the derivation.