Sacrobosco, Noviciis adolescentibus, 1485 ([1]2r)

Sacrobosco’s works were some of the most influential astronomical texts of the middle ages. It was frequently collected with works from Regiomantus and Peurbach as a textbook on the subject. The incipit (even though it’s not preceded by the phrase) provides the title under which this collection is cataloged, rather than the more commonly used De sphaera mundi.