De nauigatione libri tres : quibus mathematicæ disciplinæ explicantur:
De nauigatione libri tres is a 1549 navigation treatise by Diogo de Sá, printed in Paris by the Calderij press for a scholarly audience of mariners and mathematicians. Its pictures are plain geometric diagrams of circles, poles, horizons and equators drawn with lettered points and lines, offering a designer clean, instructional schematics built from a few strokes and labels.
