| 词条 | Kushyar Gilani |
| 释义 |
Abul-Hasan Kūshyār ibn Labbān ibn Bashahri Gilani (971–1029), also known as Kūshyār Gīlānī ({{lang-fa|کوشیار گیلانی}}), was an Iranian[1][2] mathematician, geographer, and astronomer from Gilan, south of the Caspian Sea, Iran. CareerHis 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
References1. ^{{cite book | last = Hockey | first = Thomas | title = Biographical encyclopedia of astronomers | publisher = Springer | location = New York | year = 2014 | page=1074 | isbn = 9781441999184 |quote=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.}} 2. ^{{cite book | last = Selin | first = Helaine | title = Encyclopaedia of the history of science, technology, and medicine in non-western cultures | publisher = Springer | location = Berlin New York | year = 2008 | isbn = 9781402049606 | page=241 | quote=Another important early treatise that publicized decimal numbers was Iranian mathematician and astronomer Kūshyār ibn Labbān’s (fl. 1000) Kitāb fī usūl hisāb al-hind (Principles of Hindu Reckoning), a leading arithmetic textbook.}} 3. ^E. S. Kennedy, A Survey of Islamic Astronomical Tables, (Transactions of the American Philosophical Society, New Series, 46, 2), Philadelphia, 1956, pp. 3, 34-5. Sources
External links
14 : 971 births|1029 deaths|Astronomers of medieval Islam|10th-century mathematicians|11th-century mathematicians|10th-century Muslims|11th-century Muslims|Medieval Persian astronomers|Medieval Persian mathematicians|Mathematicians of medieval Islam|11th-century astronomers|10th-century Iranian people|11th-century Iranian people|People from Gilan Province |
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