Alam al-Din Ibn-Abidin al-Hanafi (Arabic: علم الدين تعاسيف; 1178 - 1251 )
was an Egyptian mathematician, astronomer and engineer during the
Ayyubid period.
Alam al-Din was born in Egypt, son of a well-known
Egyptian scholar Abidin Ibn al-Hanafi. He later moved to Mosul and then to
Syria where he settled and accomplished most of his engineering works. He died
in Damascus in 1251.
Al-Hanafi wrote a treatise on the postulates of
Euclid, designed water mills and fortifications on the Orontes river, and built
the second oldest Arab celestial globe in the world, that is the representation
of stars and constellations given their apparent positions in the sky. The
celestial globe was used by Al-Hanafi above all for some astronomical
calculations, astrological purposes and as an ornament. Some of his water mills
and fortifications on the Orontes are considered one of the best hydraulic
engineering works in the Arab world and many still exist to this day.
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Mathematician
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