Ulugh Beg Observatory, Samarkand. Museum and Observatory of Mirzo Ulugbek. 

Video tour to the Ulugbek Observatory, remains of a 14th-15th century sextant and the Ulugbek museum.
The largest observatory in Central Asia was built in the 1420's by Ulugbeg. Here, for three decades, scholars, including the outstanding astronomers Qazi-Zadeh Rumi, Djemsnid Giyas ad-Din Kashi and Ali Kushchi, performed measurements of celestial movements. The Samarkand observatory became famous for the edition of the "Ulugbeg Zidj", containing a theoretical introduction and charts describing 1,018 stars. The observatory was found by Samarkand archeologist V. L. Vyatkin at the beginning of the 20th century. He excavated the underground remains of a huge quadrant 40 m in radius which was used for the observation of the Sun, Moon and other celestial bodies.
Ulugh Beg was one of the grandsons of the founder of the Timurid Empire Amir Temur.
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Observatory of Ulugbek, Samarkand: www.orexca.com...
One-Day Samarkand City Tour: www.orexca.com...
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Обсерватория Улугбека, Самарканд: www.orexca.com...
Экскурсия по Самарканду: www.orexca.com...