ROJAS SARMIENTO, JUAN DE. Fl.1540-1550.:Commentariorum in Astrolabium quod Planisphaerium Vocant, Libri Sex nunc Primum in Lucem Editi. Paris: Michael Vascosan, 1550. 8vo (230 x 165 mm). Woodcut illustrations and diagrams, including 15 full-page illustrations of the astrolabe, woodcut initials. [xxiv], 282, [12] pp, lacking 2M6 (blank), italic type. Modern full paneled cat\'s paw calf, spine gilt; title extended and repaired, slight foxing, a few pages with extensive early ink marginalia, E1 lower corner repair.
FIRST EDITION of this important treatise on the astrolabe, presenting Rojas\' model for a universal astrolabe with orthographic projection. \"The chief novelty in [the astrolabe] consisted in a special treatment of the face of the instrument as an orthographic projection of the sphere on the plane of the meridian\" (Gunther, Astrolabes of the World). Houzeau Lancaster 3275; Mortimer, Harvard French 462.
ROJAS SARMIENTO, JUAN DE. Fl.1540-1550.:Commentariorum in Astrolabium quod Planisphaerium Vocant, Libri Sex nunc Primum in Lucem Editi. Paris: Michael Vascosan, 1550. 8vo (230 x 165 mm). Woodcut illustrations and diagrams, including 15 full-page illustrations of the astrolabe, woodcut initials. [xxiv], 282, [12] pp, lacking 2M6 (blank), italic type. Modern full paneled cat\'s paw calf, spine gilt; title extended and repaired, slight foxing, a few pages with extensive early ink marginalia, E1 lower corner repair.
FIRST EDITION of this important treatise on the astrolabe, presenting Rojas\' model for a universal astrolabe with orthographic projection. \"The chief novelty in [the astrolabe] consisted in a special treatment of the face of the instrument as an orthographic projection of the sphere on the plane of the meridian\" (Gunther, Astrolabes of the World). Houzeau Lancaster 3275; Mortimer, Harvard French 462.