Abu Sa'id al-Dharir al-Jurjani (), also Gurgani, was a 9th-century Persian mathematician and astronomer from Gurgan (Jurjan), Iran. He wrote a treatise on geometrical problems and another on the drawing of the meridian. George Sarton considers him a pupil of Ibn al-A'rabi, but Carl Brockelmann 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) See also List of Iranian scientists Sources H. Suter. Mathematiker (12, 1900). 845 deaths 9th-century Iranian mathematicians Year of birth unknown 9th-century Iranian astronomers Astronomers of the medieval Islamic world People from Gorgan Persian physicists