Back De sphaera mundi Catalan De sphaera mundi Spanish De sphaera mundi French Tractatus de Sphaera Italian De sphaera mundi Dutch De sphaera mundi NB Johannes de Sacrobosco Portuguese
 | This article needs additional citations for verification. (August 2020) |
De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The Sphere of the Cosmos; the Latin title is also given as Tractatus de sphaera, Textus de sphaera, or simply De sphaera) is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c. 1230. Based heavily on Ptolemy's Almagest, and drawing additional ideas from Islamic astronomy, it was one of the most influential works of pre-Copernican astronomy in Europe.