This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

Sphaera Ioannis de Sacrobosco, Emendata (Vineti ed.)
Johannes de Sacrobosco’s work defined how the medieval world understood the heavens. You will learn why we live on a sphere, how the planets move, and how ancient scholars calculated the clockwork of the cosmos.