The Toledan Tables, or Tables of Toledo, were astronomical tables which were used to predict the movements of the Sun, Moon and planets relative to the fixed stars. They were a collection of mathematic tables that describe different aspects of the cosmos including prediction of calendar dates, times of cosmic events, and cosmic motion. Origins The Toledan Tables were completed around 1080 by a group of Arabic astronomers at Toledo, Spain. They had started as preexisting Arabic tables made elsewhere, and were numerically adjusted to be centered on the location of Toledo. The Tables of Toledo were partly based on the work of al-Zarqali (known to the West as Arzachel), an Arab mathematician, astronomer, astronomy instrument-maker, and astrologer, who lived in Toledo. The tables were produced by a team whose membership is largely unknown, with the exception of al-Zarqali. Toledo came under Christian Spanish rule in the mid-1080s, shortly after the tables were completed. A century later at Toledo, the Arabic-to-Latin translator Gerard of Cremona (1114–1187) translated for Latin readers the Tables of Toledo, the most accurate compilation in Europe at the time. This collection of tables was influenced heavily by the work of earlier astronomers and tables such as that of Ptolematic tables and the work of al-Battānī. What the Toledan Tables didn't derive from previous texts was their parameters for the mean motion of celestial bodies. These parameters use sidereal co-ordinates which is different than other tables, Ptolemy's are tropical for instance. During the mid-thirteenth century, Campanus of Novara constructed tables for the meridian of Novara from the Toledan tables of al-Zarqali. The original version of the Arabic Toledan Tables have been lost but there is still over one hundred versions of the Latin translation which were used for a Greek translation of the Toledan Tables, written in Cyprus in the 1330s, likely by the Greek Cypriot scholar George Lapithes. There are a fair amount of errors in the Toledan Tables' calculations. The Toledan Tables are almost entirely a collection of copies of other tables. Because of this, the many errors and discrepancies are primarily considered to be copy errors. Historical Uses The Toledan Tables were updated in the 1270s by the Alfonsine tables, which were produced at Toledo, in Spanish and Latin, from the original tables of two centuries earlier. The descendants of the Toledan Tables, as updated with some corrections, were the most widely used astronomy