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A new & correct map of Negroland and Guinea


A new & correct map of Negroland and Guinea



Picryl description: Public domain image from the Schomburg Center for Research in Black Culture in Harlem, free to use, no copyright restrictions image. The Schomburg Center for Research in Black Culture in Harlem is one of The New York Public Library’s research libraries devoted to the research, preservation, and exhibition of materials focused on African American, and African experiences.

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.



1700 - 1798


Rollos, G., fl. 1754-1789, Author


New York Public Library

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Creative Commons CC0 1.0 Universal Public Domain Dedication ("CCO 1.0 Dedication")

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