Mathematical methods in the tables of planetary motion in Kūshyār ibn Labbān's \textit{Jāmi\(^c\) zīj} (Q1277359)

This paper analyzes the tables of planetary motion in the \textit{Jāmi\(^c\) Zīj} by Kūshyār ibn Labbān, an Iranian scientist who flourished ca. A.D. 1000. It gives indications for the use of the tables and defines the tabulated functions. As an unusual feature the Iranian Zīj, on the Ptolemaic and al-Battānī's tradition, contains double-argument tables for the planetary equation of the anomaly. Also, Kūshyār attempted to simplify the determination of a planet's longitude at a given time.