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Abul-Hasan Kūshyār ibn Labbān ibn Bashahri Daylami (971–1029), also known as Kūshyār Daylami (Persian: کوشیار دیلمی), was an Iranian[1][2] mathematician, geographer, and astronomer from Daylam, south of the Caspian Sea, Iran.

Career

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. For example, he continued the investigations of Abul Wáfa, and devoted much space to this in his zij (or collection of tables) az-Zīj al-Jamī wal-Baligh ("the comprehensive and mature tables"), which incorporated the improved values of the planetary apogees observed by al-Battani.[3] The tables were translated into Persian before the end of the century. 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.

See also

• List of Iranian scientists
• zij

References

Sources

• H. Suter: Mathematiker und Astronomen der Araber (83, 235, 1900; 168, 1902).
• M Levey and M Petruck (trs.), Kushyar ibn Labban, Principles of Hindu reckoning (Madison, 1965).

External links

• Bagheri, Mohammad (2007). "Ibn Labbān, Kūshyār: Kiyā Abū al‐Ḥasan Kūshyār ibn Labbān Bāshahrī al‐Jīlī (Gīlānī)". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 560–1. ISBN 978-0-387-31022-0. (PDF version)
• Laban's Bio from St Andrew's School of Mathematics website, Scotland.

На других языках

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- [en] Kushyar Gilani

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[it] Kushyar ibn Labban

Abū l-Ḥasan Kūshyār ibn Labbān ibn Bashahrī Gīlānī (in persiano أبو الحسن كوشيار بن لبان الجيلي‎, "Abū l-Ḥasan Kūshyār ibn Labbān al-Jīlī"; Gilan, 971 – Baghdad, 1029) è stato un astronomo, matematico e geografo persiano, originario del Gilan, a S del mar Caspio (Iran).

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[ru] Кушьяр ибн Лаббан

Абу-л-Хасан Кушьяр ибн Лаббан ибн Башахри ал-Джили (перс. کوشیار گیلانی‎, Гилян, 971 — Багдад, 1029) — газневидский математик и астроном. Его учеником был ан-Насави.

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