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...

named in his memory. About 1230, his best-known work, Tractatus de Sphaera / De Sphaera Mundi (Treatise on the Sphere / On the Sphere of the World) was...

1180–84 Tractatus de Sphaera, or De sphaera mundi, the basic elements of astronomy written by Johannes de Sacrobosco c. 1230 Tractatus de superstitionibus...

in 1623. In 1626, Burgersdijk was tasked with editing Johannes de Sacrobosco’s De sphaera to rid the book of its Latin. Burgersdijk participated in two...

relied on introductions to the Ptolemaic system such as the De sphaera mundi of Johannes de Sacrobosco and the genre of textbooks known as Theorica planetarum...

picture of a small paper boat in an edition of Tractatus de sphaera mundi from 1490 by Johannes de Sacrobosco. However it is very likely that paper folding...

A[cronius] with the philologist and botanist Johannes Atrocianus". De motu terrae De sphaera De astrolabio et annuli astronomici confectione Cronicon und Prognosticon...

been noted to be spherical. For example, Johannes de Sacrobosco (1195–1256) wrote in his De sphaera mundi ("Treatise on the Sphere"): That the earth,...

French prose romance Guillaume de Lorris – First section of Romance of the Rose Johannes de Sacrobosco – De sphaera mundi Snorri Sturlusson – Heimskringla...

including Johannes de Sacrobosco's De sphaera mundi, Petrus Apianus's Cosmographia seu descriptio totius orbis and Regiomontanus's De triangulis omnimodis...