Jābir ibn Aflaḥ flourished probably in twelfth-century Andalusia. He wrote a treatise entitled Iṣlāḥ al-Majisṭi (Correction of the Almagest) [Berlin MS 5653 is a reworking of Ptolemy’s work]. [BEA, Calvo; article contains more detailed info on the Iṣlāḥ]