Ulugh Beg Observatory
Ulugh Beg Observatory
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Ulugh Beg Observatory

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Ulugh Beg Observatory

The Ulugh Beg Observatory is an observatory in modern day Samarkand, Uzbekistan, which was built in the 1420s by the Timurid astronomer Ulugh Beg. This school of astronomy was constructed under the Timurid Empire, and was the last of its kind from the Islamic Medieval period. Islamic astronomers who worked at the observatory include Jamshid al-Kashi, Ali Qushji, and Ulugh Beg himself. The observatory was destroyed in 1449 and rediscovered in 1908.

Ulugh Beg, the son of Shah Rukh and grandson of Amir Timur, became the ruler of Samarkand in the 15th century AD. Ulugh Beg was very skilled in mathematics and astronomy. He taught many important astronomers, including Ali Qushji.

Many historians have tried to accurately identify the dates of the events that occurred during the Samarkand or Ulugh Beg Observatory. The differences in interpreting dates and citations of historical sources have caused inaccuracies and neglect of some events during this time.

In Jamshid al-Kashi's letters to Ulugh Beg's father, you can see Ulugh Beg's visit to the Maragha Observatory had an effect on Ulugh Beg. This could have affected Ulugh Beg's reason for his transformation of the city of Samarkand and his mathematical orientation. Other matters such as, political, economic, military, social, and even commercial reasons could have played a role in the building of Ulugh Beg's observatory. Another reason of starting his own observatory could have been because of Ulugh Beg's differences in observations of those with al-Sūfī.

The foundation for Ulugh Beg Observatory was laid in the earlier half of the 1420s (823 AH). Although the year of its completion is still debated, the observatory was completed around 1428 AD (831 AH). Many Old Persian texts reference the Samarkand Observatory and Ulugh Beg.

He invited skillful mathematicians and astronomers to help build this observatory and also a madrassa in Samarkand. Among those he invited were Ghīyāth al-Dīn Jamshid al-Kashi, Mu’in al-Din al-Kashi, Salah al-Din Qadi Zada Rumi, and Ali Qushiji. Over 60 mathematicians and astronomers were invited to the observatory. Jamshīd al-Kāshī was appointed as the first director of the observatory. After al-Kashi's death Qadi Zada became the director of the observatory. After the death of Qadi Zada, Qushji led the observatory as the last and final director. The Samarkand Observatory was a place for astronomers and mathematician to work together in finding new discoveries.

Ulugh Beg's observatory was built according to the plans of the Maragha observatory, which was designed by Nasir al-din al-Tusi. Ulugh Beg's observatory included the largest quadrant principle device. The building was not tall but was allowed a maximal size for the arc of the circle. This device was carefully oriented, and the arc was scaled very accurately. This device was very versatile. It could accurately measure the sun from the horizon, the altitude of a star and other planets. The duration of the year, period of planets, and eclipses were measured by this device. Ulugh Beg's measurements of planets closely relate to today's measurement, showing us the phenomenal accuracy of the device.

Today, the foundations and the buried part of the marble quadrant are all that are visible of the original vestiges of the Ulugh Beg Observatory. Much of the decline of the observatory has been attributed to Ulugh Beg's assassination by his son, Abd al Latif, around 1449 (852 AH). Ulugh Beg's death caused chaos within the observatory. The observatory was destroyed and dozens of talented astronomers and mathematicians were driven away. In 1908, the Russian archaeologist Vassily Vyatkin uncovered the remains of the observatory.

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