The grandson of Amir Taimur was not just a ruler but also a scientist and an astronomer. He built this observatory on top of a hill. It was reputed to be one of the finest observatories of the Muslim world. Ulugh Beg built the Ulugh Beg medressah in 1420 where 70-80 of his students worked. Then in 1424 he built this observatory to facilitate his team. In this he along with his team of scientists determined the places of the fixed stars in longitude and latitude. This helped in prediction of eclipses and in calculating the sunrise timings. These scientists also calculated the length of the stellar year at 365 days, 6 hours, 10 minutes and 8 seconds, only about 1 minute longer than the modern electronic calculations. The observatory was sadly destroyed by the religious fanatics in 1449 and buried underground until it was rediscovered in 1908. There is also a lovely little museum,on top of the hill, dedicated to the life and works of this great man.
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