Book of Optics
He edited for Latin readers the "Toledan Tables", the most accurate compilation of astronomical/astrological data (ephemeris) ever seen in Europe at the time, which were partly based on the work of al-Zarqali and the works of Jabir ibn Aflah, the Banu Musa brothers, Abu Kamil, Abu al-Qasim, and Ibn al-Haytham (including the "Book of Optics").