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As the armies of Genghis KhanGenghis Khan ( Mongolian: Jenghis Khan Jinghis Khan Chinghiz Khan Jinghiz Khan Chinggis Khan Changaiz Khan original name Temujin Temuchin Mongolian: (c. 1155/ 1162/ 1167 August 18, 1227) was a great Khan of Mongol Empire and a military leader. Following t 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 (Ghenghis Khans' son) ranks, after the invasion of the AlamutAlamut was once a mountain fortress in the arid hills south of the Caspian Sea, near Quazin, about 100 km from present-day Tehran in Iran. Only ruins remain of this fortress today. In 1090 the fortress was invaded and occupied by the powerful Hashshashin castle of the HashshashinThe Hashshashin (also Hashishim , or Assassins were a religious group (some would say, a cult) of Ismaili Muslims (from the Nizari sub-sect) with a militant basis, thought to be active in the 8th to 14th (?) centuries as a group of brigands on the medieva (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 PtolemyThis article is about the geographer and astronomer Ptolemy. For Alexander the Great's general, see Ptolemy I of Egypt. For others, see Ptolemy (disambiguation). Claudius Ptolemaeus (Greek: Klaudios Ptolemaios; A. circa 85 circa 165), known in English as and Copernicus, he is considered as the most eminent scientist on this field.
He is also known by 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 equinoxeEquinoxe is the second album by Jean Michel Jarre, and released in 1978 on Disques Dreyfus, licensed to Polydor. The album reflects the all day life of a human being, from morning to night. Two singles were released from the album, Part 5 first, after thas 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.
A 60-km diameter moon crater located on the southern hemisphere is named after him as "Nasireddin".
Tusi, Nasreddin