Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī (Arabic: أبو العباس الفضل بن حاتم النيريزي, Latin: Anaritius, Nazirius, 865–922) was a Persian mathematician and astronomer from Nayriz, Fars Province, Iran.
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.
Ibn al-Nadim mentions Nayrizi as a distinguished astronomer with eight works by him listed in his book al-Fihrist.
- Hamilton Alexander Rosskeen Gibb (1993). The Encyclopaedia of Islam: MIF-NAZ. Brill. p. 1050.
AL-NAYRIZI, ABU 'L-CABBAS AL-FADL B. HATIM, Persian geometer and astronomer
- Nelsen, Roger B. (November 2003), "Paintings, plane tilings, and proofs" (PDF), Math Horizons: 5–8. Reprinted in Haunsperger, Deanna; Kennedy, Stephen (2007), The Edge of the Universe: Celebrating Ten Years of Math Horizons, Spectrum Series, Mathematical Association of America, pp. 295–298, ISBN 978-0-88385-555-3. See also Alsina, Claudi; Nelsen, Roger B. (2010), Charming proofs: a journey into elegant mathematics, Dolciani mathematical expositions, 42, Mathematical Association of America, pp. 168–169, ISBN 978-0-88385-348-1. Nelsen uses the "Annairizi" form of his name; for the identification of it with Anaritius, see Isis, vol. 6, p. 515.
- Sabra, A. I. (2008) [1970-80]. "Al-Nayrīzī, Abu'l-'Abbās Al-Faḍl Ibn Ḥātim". Complete Dictionary of Scientific Biography. Encyclopedia.com.
- DeYoung, Gregg (2007). "Nayrīzī: Abū al‐ʿAbbās al‐Faḍl ibn Ḥātim al‐Nayrīzī". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. p. 823. ISBN 978-0-387-31022-0. (PDF version)
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