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Descripción de la Bahía de Sn. Gregorio sitda. en la latd. S. de 45 gs. 2. ms. y en la longd. de 310. gs. 55 ms., meridians de Thenerife.
Descripción de la Bahía de Camarons. situada en la latd. S. de 44 grs. 50 ms. y en la longitud de 310 grs. 50 ms. según el meridiano de Thenerife.
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 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
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.
Descripción de la Bahía de Camarones situada en lattd. S. de 44⁰ 50ʹ y en longd. de 310⁰ 50ʹ según el meridiano de Thenerife /
Plano de la Bahía del Guantánamo en la costa del S. de la ysla de Cuba cituado en la latd. N. de 20 gs. y en longd. de 301⁰27ʹ segn. Tene.
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.
Plano de Puerto Belo cituado en la costa del N. de Trra. Firme en la latd. N. de 9 gs. 18 ms. y en longd. de 294 gs. 45 ms. segun el merido. de Tenerife.
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.
Summary
Prime meridian: Tenerife.
Depths shown by soundings.
Watermark: C. & I. Honig.
Pen-and-ink and watercolor.
Mounted on cloth backing.
LC Luso-Hispanic World, 130
Available also through the Library of Congress Web site as a raster image.
Annotated in black ink: N. 9 [indecipherable].
Maggs number annotated in pencil in lower right corner: 282.
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.