Ibn Yunus

Abu al-Hasan 'Ali ibn Abi al-Said 'Abd al-Rahman ibn Ahmad ibn Yunus ibn Abd al-'Ala al-Sadafi al-Misri (Egyptian Arabic: ابن يونس; c. 950 – 1009) was an important Egyptian astronomer and mathematician, whose works are noted for being ahead of their time, having been based on meticulous calculations and attention to detail. He is one of the famous Muslim astronomers who appeared after Al-Battani and Abu al-Wafa' al-Buzjani, and he was perhaps the greatest astronomer of his time. Because of his brilliance, the Fatimids gave him generous gifts and established an observatory for him on Mount Mokattam near Fustat. Al-Aziz Billah ordered him to make astronomical tables, which he completed during the reign of Al-Hakim bi-Amr Allah, son of Al-Aziz, and called it al-Zij al-Kabir al-Hakimi.

Ibn Yunus
Born
Abu al-Hasan 'Ali Abi al-Said ibn 'Abd al-Rahman ibn Ahmad ibn Yunus bin Abd al-'Ala al-Sadafi al-Misri (أبو الحسن علي أبي السعيد بن عبد الرحمن بن أحمد بن يونس بن عبد الأعلى الصدفي المصري)

950
Fustat, Ikhshidid Emirate of Egypt, now Egypt
Died6 June 1009
Cairo, Egyptian Fatimid Caliphate, now Egypt
Occupation(s)Astronomer, astrologer, mathematician, philosopher
EraIkhshidid era
Abbasid era
Fatimid era
Notable work
  • Al-Zij al-Kabir al-Hakimi
  • Bulugh al-Umniyya
  • Zij ibn Yunus
  • Ghayat al-Intifah fi Mareafat al-Da'ir min al-Falak min qabl al-Iritifah

The crater Ibn Yunus on the Moon is named after him.

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