From: Thomas Hockey et al. (eds.). The Biographical Encyclopedia of Astronomers, Springer Reference. New York: Springer, 2007, p. 570 Courtesy of Springer.

Y. Tzvi Langermann

Ibn Sid: Isaac ibn Sid

FlourishedToledo, (Spain), circa1250

Ibn Sid is believed to have played an important role in the observations and other research sponsored by Alfonso X of Castille, all of which bore fruit in the Alfonsine Tables. Some of his observations are mentioned by Isaac Israeli, another Jewish astronomer from Toledo, who worked nearly a century after Ibn Sid. Otherwise, nothing is known about this figure.

Selected Reference

Richter‐ Bernburg, Lutz (1987). “Ṣāʿid, the ToledanTables, and Andalusī Science.” In From Deferent to Equant: A Volume of Studies in the History of Science in the Ancient and Medieval Near East in Honor of E. S. Kennedy, edited by David A. King and George Saliba, Vol. 500, pp. 373–401. Annals of the New York Academy of Sciences. New York: New York Academy of Sciences.