Ulugh Beg


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Title assumed by Muhammad Taragi (1394–1449), Mongol ruler and astronomer, born in modern Iran. In 1420 he established an observatory at Samarkand, in modern Uzbekistan. He equipped it with a huge (radius 40 m) sextant of stone which allowed observations accurate to a few seconds of arc to be made. The result was the first original star catalogue since those of Ptolemy and al-*Ṣūfī, which it surpassed in precision.

Subjects: Astronomy and Astrophysics.

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