Abul-Hasan Kūshyār ibn Labbān ibn Bashahri Gilani (971–1029), also
known as Kūshyār Gīlānī (Persian: کوشیار گیلانی), was
an Iranian mathematician, geographer,
and astronomer from Gilan, 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. 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.
Sumber
Labels:
Mathematician
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