Observatory of Ulugh Beg

The biggest observatory was built in 1420s by Ulugbeg. Here, during three decades, scholars, including outstanding astronomers Qazi-Zadeh Rumi, Djemshid Giyas ad-Din Kashi and Ali Kushchi, had been carrying out measurements of celestial moments. The Samarqand observatory became famous for the edition of "Ulugbeg Zidj", containing theoretical introduction and tables of 1018 stars. The observatory was found by Samarqand archeologist Vyatkin V.L at the beginning of the 20th century. He excavated underground remains of huge quadrant of 40 m in radius that was used for observation of the Sun, Moon and other celestial boodles.