Philolai, sive, Dissertationis de vero systemate mvndi, libri IV
Philolai, sive, Dissertationis de vero systemate mvndi is a 1639 Latin astronomy treatise by the French astronomer Ismael Boulliau, printed in Amsterdam by the Blaeu firm for scholarly readers of cosmology. Its pictures are plain geometric diagrams of concentric circles, radii, and lettered points drawn in brown ink on cream paper, offering a designer a clean, schematic vocabulary of orbits and intersecting lines.
