Abu Sa'id al-Dharir al-Jurjani (), also Gurgani, was a 9th-century

Persian Persian may refer to: * People and things from Iran, historically called ''Persia'' in the English language ** Persians, the majority ethnic group in Iran, not to be conflated with the Iranic peoples ** Persian language, an Iranian language of the ...

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

and

astronomer An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either ...

from

Gurgan Gorgan ( fa, گرگان ; also romanized as ''Gorgān'', ''Gurgān'', and ''Gurgan''), formerly Esterabad ( ; also romanized as ''Astarābād'', ''Asterabad'', and ''Esterābād''), is the capital city of Golestan Province, Iran. It lies appro ...

(Jurjan),

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

. He wrote a treatise on geometrical problems and another on the drawing of the

meridian Meridian or a meridian line (from Latin ''meridies'' via Old French ''meridiane'', meaning “midday”) may refer to Science * Meridian (astronomy), imaginary circle in a plane perpendicular to the planes of the celestial equator and horizon * ...

George Sarton George Alfred Leon Sarton (; 31 August 1884 – 22 March 1956) was a Belgian-born American chemist and historian. He is considered the founder of the discipline of the history of science as an independent field of study. His most influential work ...

considers him a pupil of

Ibn al-A'rabi Abū ʿAbd Allāh Muḥammad ibn Ziyād (), surnamed Ibn al-Aʿrābī () (ca. 760 – 846, Sāmarrā); a philologist, genealogist, and oral traditionist of Arabic tribal poetry. A grammarian of the school of al-Kūfah, who rivalled the grammari ...

, but

Carl Brockelmann Carl Brockelmann (17 September 1868 – 6 May 1956) German Semiticist, was the foremost orientalist of his generation. He was a professor at the universities in Breslau, Berlin and, from 1903, Königsberg. He is best known for his multi-volume ...

rejects this opinion.

Works

Two of his works are extant: * Masa'il Hindisia (a manuscript is available in Cairo) * Istikhraj khat nisf al-nahar min kitab analima wa al-borhan alayh (available in Cairo, translated by Carl Schoy)

Sources

* H. Suter. ''Mathematiker'' (12, 1900). 845 deaths 9th-century Iranian mathematicians Year of birth unknown 9th-century Iranian astronomers People from Gorgan Persian physicists {{astronomer-stub

Works

See also

Sources