| Nasir Al-din Tusi |
Article Index for Nasir |
Website Links For Nasir |
Information AboutNasir Al-din Tusi |
|
He was perhaps the first to treat Trigonometry as a distinct mathematical discipline and in his ''Treatise on the Quadrilateral'' he was the first to list the six distinct cases of a right angled triangle in Spherical Trigonometry . As the armies of Genghis Khan swept his homeland, he fled to join the Ismailis and made his most important contributions in science during this time, while he was moving from one stronghold to another. He finally joined Hulagu 's (Genghis Khan's son) ranks, after the invasion of the Alamut castle of the Hashshashin (Assassins) by Mongol forces. Tusi made very accurate tables of planetary movements as depicted in his book ''Zij-i ilkhani'' (the Ilkhanic Tables). This books contains tables for calculating the positions of the planets and the names of the stars. His planetary system was the most advanced of his period and was used extensively until the development of the heliocentric model in the time of Copernicus . Between Ptolemy and Copernicus , he is considered as the most eminent scientist on this field. He has invented the geometrical technique called a Tusi-couple , which resolves linear motion into the sum of two circular motions. He also calculated the value of 51' for the precession of the Equinoxe s and contributed to construction and usage of some astronomical instruments including Astrolabe . He gave the first extant exposition of the whole system of plane and Spherical Trigonometry . The famous observatory in Maragheh was built for this scientist. A 60-km diameter lunar Crater located on the southern hemisphere of the Moon is named after him as " Nasireddin ". EXTERNAL SOURCE SEE ALSO |
|
|