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Related
Carte de la decouverte faite l'an 1673 dans l'Amerique Septentrionale
Carte de la découverte faite l'an 1673 dans l'Amérique septentrionale.
Carte de l'Amérique septentrionale, 1754
Carte de l'Amérique septentrionale, 1754.
Carte de l'Amérique septentrionale, 1755.
A new map of North America : from latest discoveries, 1778 /
America Settentrionale colle nuoue scoperte fin al'anno 1688, diuisa nelle sue parti secundo lo stato /
Kaart van de Noordzee, ca. 1706-1712
A new map of North America from the latest discoveries, 1763.
Carte de la decouverte faite l'an 1673 dans l'Amerique Septentrionale /
Summary
Oriented with north to the right.
Relief shown pictorially.
Available also through the Library of Congress Web site as a raster image.
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.