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Arabic Lefends bin Yunis

Another celebrated astronomer, Ali bin Yunis, was a native of Egypt, and appears to have lived at the court of the demented tyrant of Egypt, Al-Hakim bramrillah, and under his patronage to have composed the celebrated astronomical tables called, after his name, 'The Hakimite Tables.' Ibn Khallikan states that he had seen these tables in four volumes, and that more extensive ones had not come under his notice.

These tables were considered in Egypt to be of equal value to those of the astronomer Yabya bin Ali Mansur, who had in A.D. 830, by order of the Khalif Mamun, undertaken astronomical observations both at Baghdad and Damascus. Ibn Yunis spent his life in the preparation of astronomical tables and in casting horoscopes, for it must be remembered that with the Muslims astronomy and astrology were synonymous, and their most learned astronomers were also their most skilful astrologers.
His character for honesty was highly esteemed, and he was also well versed in other sciences, and displayed an eminent talent for poetry. He died A.D. 1009, and is not to be confounded with his father, Ibn Yunis, the historian, who died A.D. 958.