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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ab 'l-'Abb?'s al-Fa l ibn tim al-Nair z, 865-922 was a 9th-10th century Persian mathematician and astronomer from Nayriz, 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 Persian work on the subject. It is divided into four more

Product details

  • Paperback | 64 pages
  • 152 x 229 x 4mm | 104g
  • Bellum Publishing
  • United States
  • English
  • 6136651971
  • 9786136651972