Background
Mirza Mahommed Ben Shah Rok Ulugh Beg was a son of the shah Rok and grandson of Timur, succeeded his father as prince of Samarkand in 1447, after having for years taken part in the government.
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Mirza Mahommed Ben Shah Rok Ulugh Beg was a son of the shah Rok and grandson of Timur, succeeded his father as prince of Samarkand in 1447, after having for years taken part in the government.
He erected an observatory at Samarkand, from which were issued tables of the sun, moon and planets, with an interesting introduction, which throws much light on the trigonometry and astronomical methods then in use (Prolegomenes des tables astronomiques d'Ouloug Beg, ed. by Sedillot, Paris, 1847, and translated by the same, 1853). The serious errors which he found in the Arabian star catalogues (which were simply copied from Ptolemy, adding the effect of precession to the longitudes) induced him to redetermine the positions of 992 fixed stars, to which he added 27 stars from Al Sufi's catalogue, which were too far south to be observed at Samarkand. He was murdered in 1449 by his eldest son.
( This work has been selected by scholars as being cultur...)