Biography Kushyar ibn Labban was from the village of Gilan, which was situated south of the Caspian sea in Persia. He is known by several different variants of his name, which has been transliterated as Kusyan, Kushiyad, Koshar, Kusiar or Kossar. Sometimes he has been called Jabah, Halebi and al-Kiya. The name Labban, sometimes written as Labbar, was his father's name and means "lion". Very little is known of Kushyar ibn Labban's life.

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His main work was probably done about the beginning of the eleventh century, and seems to have taken an important part in the elaboration of trigonometry.

He wrote also an astrological introduction and an arithmetic treatise Kitab fi usul hisab al-hind Principles of Hindu Reckoning , extant in Arabic and Hebrew. He was the teacher of Ahmad Nasawi. He is thought to have died in Baghdad.

From Wikipedia, the free encyclopedia. Biographical encyclopedia of astronomers. New York: Springer. Kushyar ibn Labban was an eminent Iranian astronomer known for his work on astronomical handbooks zijes in addition to his work in mathematics and astrology. Encyclopaedia of the history of science, technology, and medicine in non-western cultures. Berlin New York: Springer. Astronomy in the medieval Islamic world.

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## Kushyar ibn Labban

His main work was probably done about the beginning of the eleventh century, and seems to have taken an important part in the elaboration of trigonometry. He wrote also an astrological introduction and an arithmetic treatise Kitab fi usul hisab al-hind Principles of Hindu Reckoning , extant in Arabic and Hebrew. He was the teacher of Ahmad Nasawi. He is thought to have died in Baghdad.

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## Kushyar Gilani

Persian astronomer and mathematician. Like many astronomers, Kushyar approached mathematics as an aid to his work, and took a particular interest in trigonometry, studying tangent functions and assembling new astronomical tables. Perhaps Kushyar's most famous work is Kitab fi usul hisab al-hind translated in as Principles of Hindu Reckoning , in which he examined arithmetic as practiced in India. He also wrote on astrology. Cite this article Pick a style below, and copy the text for your bibliography. May 24, Retrieved May 24, from Encyclopedia.

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Kushyar ibn Labban was an Iranian astronomer and mathematician who was active around A. It is written in Arabic, the scientific language in the Islamic territories in Kushyar's time, and consists My Ph. Approximately Zijes by different authors in the Islamic astronomical tradition from the ninth to fifteenth centuries A. A Zij usually contains tables with instructions for use for the computation of solar, lunar and planetary positions. These computations are often based on the methods of Ptolemy's Almagest ca. Zijes are often also provided with auxiliary trigonometrical tables, tables for lunar crescent visibility and prayer times, tables of geographical and stellar coordinates, astrological tables, materials on calendars and tables for calendar conversions.