Sfera astronomica
Sfera astronomica is a 1690 Italian treatise on spherical astronomy by Bonaventura Cavalieri, printed in Rome by Per il Molo at the expense of Antonio Manari for students of astronomy. Its pictures are simple geometric diagrams of circles, lettered points, chords and sphere cross-sections drawn in dark brown ink on cream paper, with clear linework a designer could borrow for minimal scientific graphics.
