Brian Tung wrote:

I assume you mean, why planetary orbits *aren't circles*.

I couldn't tell. I still can't. I'm hoping the original poster
clarifies the question...

I drew the inference from his attempted explanations, which couldn't
distinguish between ellipses and other ovally shapes, and from the
context of the recent thread about ancient Greek astronomy. It's a
guess, though.

- Ernie http://home.comcast.net/~erniew