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Resultados de la Wikipedia en inglés.
- of instruments evolved from the cross-staff that can be classified as backstaffs. Only the Davis quadrant remains dominant in the history of navigation…18 kB (2473 palabras) - 20:41 8 oct 2023
- angle of the sun or a star above the horizon with an instrument such as a backstaff or quadrant. Longitude was more difficult to measure accurately because…101 kB (10 383 palabras) - 22:21 18 may 2024
- the cross-staff could not compete with the backstaff in many countries. In terms of handling, the backstaff was found to be more easy to use. However,…17 kB (2258 palabras) - 15:16 16 mar 2024
- Also, unlike the backstaff, the sextant allows direct observations of stars. This permits the use of the sextant at night when a backstaff is difficult to…22 kB (3163 palabras) - 22:58 18 may 2024
- Catalogue of the Mariner's Quadrants, Mariner's Astrolabes, Cross-staffs, Backstaffs, Octants, Sextants, Quintants, Reflecting Circles and Artificial Horizons…18 kB (2130 palabras) - 17:40 2 may 2024
- Gerardus Mercator 1589: Stocking frame: Invented by William Lee. 1594: Backstaff: Invented by Captain John Davis. By at least 1597: Revolver: Invented…222 kB (23 068 palabras) - 16:37 23 may 2024
- equivalent type of sundial using a vertical rod of fixed length is known as a backstaff dial. A shepherd's dial – also known as a shepherd's column dial, pillar…106 kB (14 043 palabras) - 07:14 24 may 2024
- back observation quadrant. This instrument was used in the manner of a backstaff to measure the elevation of the sun by observing the position of a shadow…23 kB (2881 palabras) - 03:39 26 abr 2024
- 1496 by the Castilian Jew Abraham Zacut, then exiled in Portugal. The backstaff, which measures the length of a shadow, was used from the 16th century…3 kB (353 palabras) - 06:52 17 dic 2023
- devices based on the same principle were used, notably the cross-staff and backstaff. The kamal is still a tool recommended for use in sea kayaking. In such…5 kB (684 palabras) - 19:55 19 abr 2024
- pear tree or boxwood, with an arch of 15° to 30°, it is an example of a backstaff. The sun casts that shadow of a vane (B in the adjacent image) on a horizon…4 kB (486 palabras) - 09:10 13 feb 2024
- maps. Seventeenth century marine navigation and cartography used the "backstaff" which, in this area, was accurate to one degree of longitude, or around…26 kB (2178 palabras) - 18:49 29 abr 2024
- asterism in the constellation of Ursa Major Plough (instrument), a type of backstaff, a device used for celestial navigation Plough (unit), or carucate, a…2 kB (238 palabras) - 21:24 16 sep 2023
- by Michelborne on his return to England in 1606. His invention of the backstaff and double quadrant (called the Davis quadrant after him) remained popular…14 kB (1499 palabras) - 15:11 8 may 2024
- the North Atlantic in 1495. Davis also gave the world a version of the backstaff, the Davis quadrant, which became one of the dominant instruments from…62 kB (7954 palabras) - 23:20 8 may 2024
- instrument to have an apparent accuracy of only two minutes of arc while the backstaff appeared to be accurate to one minute. The use of the vernier scale allowed…24 kB (3035 palabras) - 05:39 6 may 2024
- used, alongside determination of latitude using the quadrant (see also backstaff, astrolabe, and octant); this was the only system available to mariners…21 kB (2571 palabras) - 13:15 7 may 2024
- Catalogue of the Mariner's Quadrants, Mariner's Astrolabes, Cross-staffs, Backstaffs, Octants, Sextants, Quintants, Reflecting Circles and Artificial Horizons…12 kB (1308 palabras) - 21:47 15 oct 2023
- surface (such as the user's finger or the screen plate of a mariner's backstaff). The apertures are not viewing holes for sighting the Sun with the naked…8 kB (947 palabras) - 06:14 29 may 2023
- Catalogue of the Mariner's Quadrants, Mariner's Astrolabes, Cross-staffs, Backstaffs, Octants, Sextants, Quintants, Reflecting Circles and Artificial Horizons…10 kB (1265 palabras) - 17:38 13 abr 2024
- angle of the Sun or a star above the horizon with an instrument such as a backstaff or quadrant. Longitude was more difficult to measure accurately because…37 kB (4640 palabras) - 14:35 6 may 2024