 These astronomers included Jamshīd al-Kāshī and Ali Qushji, among others.The "Zij-i-Sultani" is generally considered the most accurate and extensive star catalogue up to its time, surpassing its predecessors, including Ptolemy's work, Abd al-Rahman al-Sufi's "Book of Fixed Stars", and the Maragheh observatory's "Zij-i Ilkhani".It was not surpassed until the work of Taqi al-Din and Tycho Brahe in the 16th century.