He is known to modern scholars for his al‐Zīj al‐kāmil fī al‐talim (1204/5), which was had a great influence on the development of Islamic astronomy and which has provided important information on astronomers from Al-Andalus, including the instrument maker and astrologer Al-Zarqali.
[citation needed] He probably worked in North Africa, at a time when the Almohad Caliphate ruled the region.
[1] In 1204/5 Ibn al‐Hāʾim wrote al‐Zīj al‐kāmil fī al‐talim ("The Perfect Handbook on Mathematical Astronomy"), a treatise that consisted of an introduction and seven books.
[1] It was considered exceptionally complete and accurate by Islamic medieval astronomers, and he had a great influence on the development of astronomy in the Maghreb.
The work also deals with the computation of the Moon's longitude and latitude, attempting to correct Ptolemy's theory.