the ellipse note [link]

Here's the write-up, with pictures.

http://astro.isi.edu/notes/

Link is at the bottom: Newton for the Not-So-Non-Faint-of-Heart. Any
questions, comments, and suggestions are welcome. Gerald, surprise me:
Resist the temptation to lavish me with praise again.

--
Brian Tung
The Astronomy Corner at http://astro.isi.edu/
Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt