Al-Nayrizi

Mathematician, Deceased Person

0865 – 0922

31

Who was Al-Nayrizi?

Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī 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, the equivalent to the tangent, as a genuine trigonometric line.

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.

Ibn al-Nadim mentions Nayrizi as a distinguished astronomer with Eight works by him listed in his book al-Fihrist.

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Born
0865
Religion
  • Islam
Nationality
  • Iran
Profession
Died
0922

Submitted
on July 23, 2013

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