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Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī ((アラビア語:أبو العباس الفضل بن حاتم النيريزي), (ラテン語:Anaritius, Nazirius), 865–922) was a 9th-10th century Persian mathematician and astronomer from Nayriz, Fars Province, 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 Persian 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. He gave a proof of the Pythagorean theorem using the Pythagorean tiling.〔. Reprinted in . See also . Nelsen uses the for "Annairizi" of his name; for the identification of it with Anaritius, see ''Isis'', vol. 6, (p. 515 ).〕 Ibn al-Nadim mentions Nayrizi as a distinguished astronomer with eight works by him listed in his book ''al-Fihrist''. ==Notes== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Al-Nayrizi」の詳細全文を読む スポンサード リンク
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