Abu Muhammad Abd al-Haqq al‐Ghafiqi al‐Ishbili (Arabic: ابن الهائم), known as Ibn al‐Hāʾim (fl. c. 1213) was
a medieval Muslim astronomer and mathematician from Seville in
Al-Andalus.
He began his studies as a mathematician and studied the works of
Al-Jayyani and Jabir ibn Aflah. He was the author of the al‐Zīj al‐kāmil fī
al‐talim (The perfect handbook on mathematical astronomy; which had seven
chapters).
He gives historical data on the life and works of Al-Zarqali and the
creation of the Tables of Toledo by astronomers in Toledo patronized by Said
Al-Andalusi. He further extends Al-Zarqali's theories on the oscillation of the
obliquity of the ecliptic, also presents the spherical trigonometrical
formulae, gives a longitude of the solar apogee of 85° 49′ and further
confirmed the works of Al-Zarqali. His work seems exceptional in Western Islam,
as very complete and accurate, and had a great influence on the development of
astronomy in the Maghreb.
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Mathematician
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