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Partie meridionale de l'Inde en deux presqu'isles l'une de ç̧à et l'autre de là le Gange /
Summary
Shows India south of the tropic of Cancer and Southeast Asia, including Indochina, Sumatra, and western Borneo.
Relief shown pictorially.
Coordinates given from an unidentified prime meridian.
Appears in his Cartes generales de toutes les parties du monde, 1658.
Available also through the Library of Congress Web site as a raster image.
LC copy hand colored.
Ancient Maps from the Library of Congress. 13th -18th Century Maps.
In the 17th century, maps took a huge leap forward. Mathematical and astronomical knowledge necessary to make accurate measurements had evolved. English mathematicians had perfected triangulation: navigation and surveying by right-angled triangles. Triangulation allowed navigators to set accurate courses and produced accurate land surveys. Seamen learned to correct their compasses for declination and had determined the existence of annual compass variation. Latitude determination was greatly improved with the John Davis quadrant. The measurement of distance sailed at sea was improved by another English invention, the common log. Longitudinal distance between Europe and Québec was determined by solar and lunar eclipses by the Jesuit Bressani in the 1640s and by Jean Deshayes in 1686. With accurate surveys in Europe, the grid of the modern map began to take shape.
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