Gurgan Zidj – catalog of the sky, consisting of 1,018 stars presents the great interest among the many astronomical tables of Ulugbek. The length of the sidereal year is determined by Ulugbek in 365 days, 6 hours and 10 minutes, 8 seconds. Samarkand astronomers were conducted the observations without optical instruments but only the naked eye. A huge influence on the development of science of the West and the East, India and China had astronomical achievements of Ulugbek School. According to researches by scientists, there were other instruments in the observatory, which unfortunately didn’t preserve.
In 1908-1909 years during the excavations were found traces of a circular wall and part of the main instrument. But these excavations didn’t produce the expected results. It was only the remains of the outer wall of the huge three-storey building. There were also found some astronomic instruments. The building had big halls, rooms and corridors, in the middle of the observatory was the main instrument – sextant.
According to the archeological remains, Ulugbek Observatory was one of the biggest observatories in Central Asia. Ulugbek occupied the place of honor among the outstanding astronomers of the world, and his astronomical work “Star table of Ulugbek” gained the worldwide fame..
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