Zij

[1] The Zij-i Sultani, published by the astronomer and sultan Ulugh Beg in 1438/9, was used as a reference zij throughout Islam during the early modern era.

[1][3] The content of zījes were initially based on that of the "Handy Tables" by Ptolemy, known in Arabic as al-Qānūn, the Zīj-i Shāh compiled in Sasanian Persia, and the Indian siddhantas by Āryabhaṭa and Brahmagupta.

Muslim zījes, however, were more extensive, and typically included materials on chronology, geographical latitudes and longitudes, star tables, trigonometrical functions, functions in spherical astronomy, the equation of time, planetary motions, computation of eclipses, tables for first visibility of the lunar crescent, astronomical and/or astrological computations, and instructions for astronomical calculations using epicyclic geocentric models.

[5] One of the most famous Indian zījes was the Zīj-i Muhammad Shāhī, compiled at Sawai Jai Singh's Jantar Mantar observatories in the Kingdom of Amber.

[6] The last known zīj treatise was the Zīj-i Bahadurkhani, written in 1838 by the Indian astronomer Ghulam Hussain Jaunpuri (1760–1862) and printed in 1855, dedicated to Bahadur Khan.