Like the earlier catalogs of Hipparchus and Ptolemy, Ulugh Beg's catalogue is estimated to have been precise to within approximately 20 minutes of arc.

These were mainly Zij treatises, including Arzachel's Tables of Toledo ( 1087 ), the Maragheh observatory's Zij-i Ilkhani ( 1272 ) and Ulugh Beg's Zij-i-Sultani ( 1437 ).

* Ulugh Beg's Zij-i-Sultani star catalogue is published.

After Timur's death, however, and the accession of Ulugh Beg's father too much of the Timurid Empire, he settled in Samarkand, which had been Timur's capital.

In Ulugh Beg's time, these walls were lined with polished marble.

xiii of the Memoirs of the Royal Astronomical Society and by Edward Ball Knobel in Ulugh Beg's Catalogue of Stars, Revised from all Persian Manuscripts Existing in Great Britain, with a Vocabulary of Persian and Arabic Words ( 1917 ).

Eventually, his reputation was rehabilitated by his relative, ' Abdullah ( 1450 – 1451 ), who placed Ulugh Beg's remains in the tomb of Timur in Samarkand, where they were found by archeologists in 1941.

* 1437 — Publication of Ulugh Beg's Zij-i-Sultani

In 1879 he published a translation of Ulugh Beg's catalogue from a Persian manuscript.

During Ulugh Beg's government the madrasah was a centre of secular science.

The empire's chief astronomer, Taqi al-Din, petitioned the Sultan to finance the building of a great observatory to rival Ulugh Beg's Samarkand observatory.

Under Ulugh Beg's government a solid block of dark green jade was placed over the grave of Tamerlane ( see picture ).

" Gienah " derives from Arabic, from Ulugh Beg's الجناح الغراب اليمن al-janāħ al-ghirāb al-yaman, meaning " the right wing of the crow ", although on modern charts it marks the left wing.

It contains trigonometric tables correct to eight decimal places based on Ulugh Beg's calculation of the sine of one degree which he calculated correctly to 16 decimal places.

Founded by Ulugh Beg in the early 15th century, the observatory made considerable progress in observational astronomy.

Computed and observed the solar eclipses of 809AH, 810AH and 811AH, after being invited by Ulugh Bek, based in Samarqand to pursue his study of mathematics, astronomy and physics.

Ulugh Khan's raid was repulsed but he returned in a month with a larger and determined army.

The Islamic astronomer al-Sufi updated it in 964, and the star positions were redetermined by Ulugh Beg in 1437, but it was not fully superseded until the appearance of the thousand-star catalogue of Tycho Brahe in 1598.

Ulugh Beg ( – Mīrzā Muhammad Tāraghay bin Shāhrukh Uluġ Beg ) ( March 22, 1394 in Sultaniyeh ( Persia ) – October 27, 1449 ( Samarkand )) was a Timurid ruler as well as an astronomer, mathematician and sultan.

Ulugh Beg was also notable for his work in astronomy-related mathematics, such as trigonometry and spherical geometry.

Ulugh Beg was born in Sultaniyeh in Persia during Timur's invasion.

The crater, Ulugh Beigh, on the Moon, was named after him by the German astronomer Johann Heinrich von Mädler on his 1830 map of the Moon.

In the early 16th century, the Yuzufzai were expelled from Kabul by Governor Ulugh Beg Mirza, who was a paternal uncle of the Mughal Emperor Babur.

It was with their support and especially the Yousafzai that a young, inexperienced Ulugh Beg ascended the throne of Kabul in the year 1470 A. D.

The policy proved successful, and as soon as trust was established, Ulugh Beg invited seven hundred elders of the Yousafzai to his court.

Originally the Ulugh Beg Madrasah was a two-storied building with four domed darskhonas ( lecture rooms ) at the corners.

The Ulugh Beg Madrasah was one of the best clergy universities of the entire Muslim Orient in the 15th Century CE.

During the reign of Ulugh Beg a doorway ( see picture ) was made to provide an entrance into the mausoleum.

Ulugh Beg, viceroy of Transoxiana, was the oldest.

Thus, only Ulugh Beg, who was an excellent mathematician but an incapable ruler, was left to succeed his father.

-1445 ), ), also known as Ulugh Muhammed and Ulanus, was twice Khan of the Golden Horde and founder of the Kazan Khanate.

As a supporter of Ulugh Beg, he was imprisoned by ' Abd al-Latif following the latter's rise to power.

Nafis ibn ‘ Iwad al-Kirmani was court physician to Ulugh Beg, the grandson of Tamerlane and the governor of Samarqand from 1409 to 1449 CE.

In about 1312 A. D, during the Muslim invasion of Srirangam by Malik Kafur, the General of Allauddin, Sultan of Delhi and in 1323 A. D during the invasion of Ulugh Khan there was a great commotion.

Originally known as Khalifatabad and nicknamed the " mint town of the Bengal Sultanate ", the city was founded in the 15th century by the warrior saint Turkish general Ulugh Khan Jahan.

October 25, 1459 ), also known as Ulugh Khan and Khan-i-Azam, was a Muslim Saint and local ruler in Bagerhat ( now in Bangladesh ).

Ophiuchus in a manuscript copy of Azophi's Book of Fixed Stars | Uranometry, 18th-century copy of a manuscript prepared for Ulugh Beg in 1417 ( note that as in all pre-modern star chart s, the constellation is mirrored, with Serpens Caput on the left and Serpens Cauda on the right ).

Serpens and Ophiuchus in a manuscript copy of Azophi's Book of Fixed Stars | Uranometry, 18th-century copy of a manuscript prepared for Ulugh Beg in 1417 ( note that as in all pre-modern star chart s, the constellation is mirrored, with Serpens Caput on the left and Serpens Cauda on the right ).

In 1437, Ulugh Beg determined the length of the sidereal year as 365. 2570370 ...< sup > d </ sup > = 365 < sup > d </ sup > 6 < sup > h </ sup > 10 < sup > m </ sup > 8 < sup > s </ sup > ( an error of + 58 seconds ).

The three madrasahs of the Registan are: the Ulugh Beg Madrasah ( 1417 – 1420 ), the Tilya-Kori Madrasah ( 1646 – 1660 ) and the Sher-Dor Madrasah ( 1619 – 1636 ).

While the contemporaneous Muslim writers usually explained Yakub Beg's death by poisoning, and the suicide theory was apparently the accepted truth among the Qing generals of the time, modern historians, according to Kim Hodong, think that the natural death ( of a stroke ) is the most plausible explanation.