Abu Sa'id Dharir Gurgani (), 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, mathematical structure, structure, space, Mathematica ...

and

astronomer An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...

from

Gurgan Gorgan (; ) is a city in the Central District of Gorgan County, Golestan province, Iran, serving as capital of the province, the county, and the district. It lies approximately to the northeast of the national capital Tehran, and some a ...

Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...

. 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-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 works were ...

considers him a pupil of Ibn al-A'rabi, but

Carl Brockelmann Carl Brockelmann (17 September 1868 – 6 May 1956) German Semitic studies, Semiticist, was the foremost Orientalism, orientalist of his generation. He was a professor at the universities in University of Wrocław, Breslau, Berlin and, from 1903, ...

rejects this opinion.

Works

Two of his works are extant: * Masa'il Hindisia (a manuscript is available in

Cairo Cairo ( ; , ) is the Capital city, capital and largest city of Egypt and the Cairo Governorate, being home to more than 10 million people. It is also part of the List of urban agglomerations in Africa, largest urban agglomeration in Africa, L ...

) * 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 Medieval Iranian astronomers People from Gorgan Medieval Iranian physicists {{astronomer-stub

Works

See also

Sources