Title: Buzjani, mathematician, astronomer.
Birth: June 10, 940 in Buzhgan, Nishapur, Iraq (now Torbat-e Jam, Iran).
Death: July 1, 998 in Baghdad, Iraq.
Main interests: Mathematics, astronomy
Notable ideas: Helped in bringing about a lot of theories in several branches of mathematics, particularly geometry and trigonometry. In geometry, solved geometrical problems such as opening of the compass and construction of parabola by points and geometrical solution of the equations. Established several trigonometric identities such as sin(a ± b) in their modern form, where the Ancient Greek mathematicians had expressed the equivalent identities in terms of chords. In astronomy, devised a wall quadrant for the accurate measurement of the declination of stars; introduced the tangent function which helped to solve problems involving right- angled spherical triangles, and developed a new technique to calculate sine tables, allowing him to construct more accurate tables than his predecesors. Studied the different movements of the moon and discovered ‘variations’. The crater Abul Wáfa on the Moon is named after him.
Works: Wrote a number of books, most of which no longer exist. Among of the extants were Kitab ‘Ilm al-Hisab, a practical book of arithmetic, al-Kitab al-Kamil (the Complete Book), Kitab al-Handsa (Applied Geometry). Also wrote rich commentaries on Euclid, Diophantos and al-Khawarizmi. — Wikipedia, islamonline.com
The Brunei Times
Friday, 25 June 2010