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Ibn Yunis : ウィキペディア英語版
Ibn Yunus
Abu al-Hasan 'Ali ibn 'Abd al-Rahman ibn Ahmad ibn Yunus al-Sadafi al-Misri (Arabic: ابن يونس) (c. 950-1009) was an important Egyptian Muslim astronomer and mathematician,〔Ivan van Sertima, ''Egypt: Child of Africa'', p. 337.〕〔Science & Technology in the Islamic World - Page 77〕〔Science in Medieval Islam: an illustrated introduction by Howard R. Turner - Page 65〕〔Eternal Egypt. (Ibn-Yunus El-Falaky ).〕 whose works are noted for being ahead of their time, having been based on meticulous calculations and attention to detail.
The crater Ibn Yunus on the Moon is named after him.
==Life==
Information regarding his early life and education is uncertain. He was born in Egypt between 950 and 952 and came from a respected family in Fustat. His father was a historian, biographer and scholar of hadith, who wrote two volumes about the history of Egypt—one about the Egyptians and one based on traveler commentary on Egypt.〔Eternal Egypt. (Ibn Yunus The Historian ).〕 A prolific writer, Ibn Yunus' father has been described as "Egypt's most celebrated early historian and first known compiler of a biographical dictionary devoted exclusively to Egyptians".〔Eickelman, Dale F. James Piscatori. ''Muslim Travellers: Pilgrimage, Migration, and the Religious Imagination''. Berkeley: University of California Press, 1990. p. 58〕 His great grandfather had been an associate of the noted legal scholar Imam Shafi.
Early in the life of Ibn Yunus, the Fatimid dynasty came to power and the new city of Cairo was founded. In Cairo, he worked as an astronomer for the Fatimid dynasty for twenty-six years, first for the Caliph al-Aziz and then for al-Hakim. Ibn Yunus dedicated his most famous astronomical work, ''al-Zij al-Kabir al-Hakimi'', to the latter.
As well as for his mathematics, Ibn Yunus was also known as an eccentric and a poet.〔.〕

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