![3. Sphaera Mundi [Sphere of the World]
Johannes de Sacrobosco (active 1230)
Venice, Italy: Bonetus Locatellus for Octavianus Scotus, 1490
Brown University Library, Lownes Science Collection
Many marginal annotations in brown ink; celestial spheres filled in by the reader](https://library.brown.edu/create/poetryofscience/wp-content/uploads/sites/63/2018/06/D22_AEON2316_QB41-S2x-1490m.jpg)
3. Sphaera Mundi [Sphere of the World]
Johannes de Sacrobosco (active 1230)
Venice, Italy: Bonetus Locatellus for Octavianus Scotus, 1490
Brown University Library, Lownes Science Collection
Many marginal annotations in brown ink; celestial spheres filled in by the reader