Ibn Yunus


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Ibn Yunus

 

Born 950; died 1009. Arab astronomer.

Ibn Yunus conducted extensive astronomical observations at an observatory near Cairo and compiled astronomical tables of the motion of the sun, moon, and planets, which for about two centuries were the best tables of their kind. He also compiled trigonometric tables. Ibn Yunus refined the values of the precessional constant and the angle of inclination of the ecliptic to the equator. He perfected the methods of the solution of plane and spherical triangles (the method of auxiliary angles).

REFERENCE

Berry, A. Kratkaia istoriia astronomii, 2nd ed. Moscow-Leningrad, 1946. (Translated from English.)
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Shaikh Zayed was pleased that the map showed the names of the ancient Arab scientists who were around during the golden era of Islam such as Abu Al Fada, Beruni, Al Battani and Ibn Yunus and others," he said.
In the Cairo manuscript, for example, a biography for Ibn Yunus is incomplete, but it is far longer and essentially complete in fols.
Ibn Yunus or Abu al-Hasan 'Ali bin 'Abd al-Rahman bin Ahmad bin Yunus al-Sadafi al-Misri was a scholar of astronomy who was under the patronage of Caliph al-Hakim of the Fatimid Dynasty in Egypt.
The author mentions scholars such as: "Jabir ibn Haiyan, al-Kindi, al-Khwarizimi, al-Farghani, al-Razi, al-Masudi, al-Tabari, Thabit ibn Qurra, al-Battani, Hunain ibn Ishaq, Abdul-i-Qasim, al-Farabi, Ibrahim ibn Sinan, al-Biruni, Ibn Sina, Ibn Yunus, al-Karhi, Abdul-i-Wafa, Ali, ibn Abbas, Ibn al-Jazzar, Ibn al-Haitham, Ali ibn Isa, al-Ghazzali, al-Zarqali, and Omar Khayyum" (61) who have contributed significantly to current Western practices and philosophies.
We find excellent scientists such as the mathematician and theologian Kamal al-Din ibn Yunus and the professors of the legal School of Baghdad, al-Nizamiyyah, among those whom Goldziher classifies among "the orthodox".
Apart from his appearance in Daftary's overview of hidden Imams and Mandis in Ismaili history, however, he is represented here only by a sixteenth-century picture of the astronomer/astrologer Ibn Yunus presenting his astronomical tables to the caliph.
See, for instance, Ta'rlkh Ibn Yunus al-Sadqfi, ed.
Bernard O'Kane on the ziyada to al-Hakim's mosque, Viktoria Meinecke-Berg on the workshop of a Fatimid pottery painter, Gayraud's report on the results of his excavations, the whole section on the sciences, but especially King on Ibn Yunus and Owen Wright on Ibn al-Tahhan's tre atise on music, and Johannes den Heijer's attempt to use Christian sources to explain the wazirate of Badr al-Jamali.