Ibn Tufail
Three of the most notable Andalusi astronomers were Ibn Tufail (d. 1185), Ibn Rushd (Averroes; d. 1198), and Nur ad-Din al-Bitruji (Alpetragius; d. 1204). All lived around the same time and focused their astronomical works on critiquing and revising Ptolemaic astronomy and the problem of the equant in his astronomical model. Instead, they accepted Aristotle's model and promoted the theory of homocentric spheres.