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Descripción del Puerto d. Sn. Julián cituado en la latitd. S. de 49 grados 20 ms. y en la longd. de 310 grs., meridiano d. Thenerife.
Descripción del Puerto de Sn. Julián situado en la latd. sur de 49 grados 20 mins. y en la longd. de 310 grados, merediano de Thenerife.
Plano del Puerto de Sn. Julián en la costa patagonica en la latitud de 49⁰ 21ʹ S y en longitud de 310⁰, meridiano de Thenerife /
Descripción del Puerto y Bahía de la Anunciación : situada en la parte Oriental de las Yslas Malvinas en la Latd. S. de 51 grs. 28 ms. y en la Longd. de 317 grados 55 minutos Meridiano de Thenerife
Plano del puerto è ysla de Sta. Catalina situada sumediania en la latitud de 27 grs. 40 mins. y en la longitud de 328 gs. 50 mins. segun el meridiano de Tenerife /
Plano del Puerto de Sn. Gregorio situado en la latitud S. 45⁰4ʹ y en la longitud 310⁰54ʹ segun el meridiano de Tenerife /
Plano del Puerto de Plata situado en la costa del norte de la Ysla de Sto. Domingo en la latd. de 19 gs. 43 ms. N. y en la longd. de 306 gs. 18 ms. segun el merido. de Tenerife.
Descripcion de la Ysla Grande de Juan Fernandez : situada en 33 grados y 45 minutos de latitud meridional y en 294 grados de longitud del Meridiano de Thenerife
Descripción de la Bahía de Sn. Gregorio, situada en latd. de 45 grs. 2 ms. sur y en longd. de 310 gs. 55 ms., merd. de Thenerife.
Descripción del Puerto de Sn. Julián situado en la latitud S. de 49 grados 20 mins. y en la longd. de 310 grs., meridiano de Thenerife.
Summary
Relief shown pictorially. Depths shown by soundings.
Oriented with north to the right.
Prime meridian: Tenerife.
Watermark: C. & I. Honig.
Pen-and-ink and yellow watercolor.
Mounted on cloth backing.
LC Luso-Hispanic World, 134
Available also through the Library of Congress Web site as a raster image.
Annotated in black ink: N. 7 [indecipherable].
Maggs number annotated in pencil in lower right corner: 72.
Includes index and notes.
Vault
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.