The present work is a commentary on Ibn al-Banna’s Kitab al-yassara fi taqwim al-kawakib al-sayyara (Book of Simplifications on the Ephemerides of the Planets). Ibn al-Banna (c.1260 -1340) was an astronomer and a mathematician who lived and died in Marrakech, Morocco. See B.A. Rosenfeld and E. Ihsanoglu, Mathematicians, Astronomers & Other Scholars of Islamic Civilisation and their Works( 7th – 19th C.), Istanbul, 2003, pp. 241 – 243, no.696. This commentary and author appear to be unrecorded.