John of Sicily was an astronomer active in Paris in the late 13th century. His only known surviving work is , a Latin commentary on the instructional material, , attached to the Toledan Tables. It was a popular work on trigonometry and planetary motion.Giancarlo Truffa (2014), "John of Sicily", in T. Hockey et al., eds., Biographical Encyclopedia of Astronomers (New York: Springer), p. 1137. It survives in ten complete manuscript copies and some further fragments. It was completed at Paris between 1291 and 1293 based in part on an earlier anonymous commentary, . John also had access to the astronomical tables of Ibn Isḥāq al-Tūnisī.C. Philipp E. Nothaft, "Were the Tables of Ibn Isḥāq al-Tūnisī known in Paris c. 1300?", Journal for the History of Astronomy 55.4 (2024): 490–503, esp. 492.
A lost work by John may be referenced in the inventory made of the library of King Charles V of France shortly after his death in 1380. A copy of John's commentary is listed and under the same name an Almagest, probably a work on planetary theory completed after the commentary.
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References
Further reading Pedersen, Fritz Saaby (1986). "Scriptum Johannis de Sicilia super canones Azarchelis de tabulis Toletanis." Cahiers de l'Institut du Moyen-Âge grec et latin, vols. 51–52.