Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī ( Latin name: Anaritius), was a 9-10th century Persian mathematician and astronomer from Nayriz, a town near Shiraz, Fars, Iran.

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  • Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī ( Latin name: Anaritius), was a 9-10th century Persian mathematician and astronomer from Nayriz, a town near Shiraz, Fars, Iran. He flourished under al-Mu'tadid, Caliph from 892 to 902, and compiled astronomical tables, writing a book for al-Mu'tadid on atmospheric phenomena. Nayrizi wrote commentaries on Ptolemy and Euclid. The latter were translated by Gerard of Cremona. Nairizi used the so-called umbra (versa), the equivalent to the tangent, as a genuine trigonometric line (but he was anticipated in this by al-Marwazi). He wrote a treatise on the spherical astrolabe, which is very elaborate and seems to be the best Arabic work on the subject. It is divided into four books: #Historical and critical introduction. #Description of the spherical astrolabe; its superiority over plane astrolabes and all other astronomical instruments. #Applications. #Applications. Ibn al-Nadim mentions Nayrizi as a distinguished astronomer with Eight works by him listed in his book al-Fihrist. (en)
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  • Al-Nayrizi (en)
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  • ar (en)
  • أبو العباس الفضل بن حاتم النيريزي (en)
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  • Abu'l Abbas al-Fadl ibn Hatim Al-Nayrizi (en)
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  • Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī ( Latin name: Anaritius), was a 9-10th century Persian mathematician and astronomer from Nayriz, a town near Shiraz, Fars, Iran. (en)
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  • Al-Nayrizi (en)
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