Johannes de Sacro Bosco (ca 1195-ca 1256)

Johannes de Sacro Bosco was a scholar, mathematician and astronomer. He wrote the influential treatise Liber de spatio temporis (On the Measurement of Time), which was used as a textbook by scholars of the Middle Ages. He is best known for his work on the computation of Easter, which he developed in his treatise Computus, and for his calculations of the motion of the planets and the precession of the equinoxes.

Sphaera mundi. [Venezia, Adam von Rottweil, about 1478] >>

Sphaera mundi. Gerardus Cremonensis: Theorica planetarum. Tractatus de motu octavae sphaerae. Bologna, Dominicus Fuscus, 1480 >>

Sphaera mundi. Georgius Purbachius: Theoricae novae planetarum. Regiomontanus: Disputationes contra Cremonensia deliramenta. Venezia, Erhard Ratdolt, 6 July 1482 >> | >>

Sphaera mundi. [Leipzig, Printer of Capotius, [=Martin Landsberg, or Andreas Frisner], about 1487-1488] >>

Sphaera mundi. Georgius Purbachius: Theoricae novae planetarum. Regiomontanus: Disputationes contra Cremonensia deliramenta. Venezia, Johannes Lucilius Santritter, and Hieronymus de Sanctis, 31 March 1488 >>

Sphaera mundi. Leipzig, Conrad Kachelofen, [1489] >>

Sphaera mundi. Georgius Purbachius: Theoricae novae planetarum. Regiomontanus: Disputationes contra Cremonensia deliramenta. Venezia, [Bonetus Locatellus], for Octavianus Scotus, 4 October 1490 >> | >>

Sphaera mundi. Georgius Purbachius: Theoricae novae planetarum. Regiomontanus: Disputationes contra Cremonensia deliramenta. Venezia, v, 14 January 1491 >> | >>

Sphaera mundi. [Leipzig], Martin Landsberg, [1494] >>

Sphaera mundi. [Leipzig], Martin Landsberg, [about 1495] >>

Sphaera mundi. [Leipzig, Wolfgang Stöckel],1498 >>

Sphaera mundi. Köln, Heinrich Quentell, 7 July 1500 >>