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The footnote 1 is missing. Encyclopedia Britannica states "Al-Zarqali also anticipated Johannes Kepler by suggesting that the orbits of the planets are not circular but ovoid." Ovoid is egg-shaped. (http://www.britannica.com/eb/article-70382/Spain)
"Relativity: an introduction to the special theory" author, Asghar Qadir does state that Al-Zarqali had a sun-centered model with the planets in elliptical orbits.
TedHuntington 22:31, 30 May 2007 (UTC)[reply]