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A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...
Fifty-seven navigational stars and additionally the star Polaris are given a special status in the field of celestial navigation. Of the approximately six thousand stars visible to the naked eye under optimal conditions, these selected stars are among the brightest and span thirty-eight constellations of the celestial sphere from the ...
Electronic Navigation, covers the primary means of positioning of the modern navigator. Chapters deal with each of the several electronic methods of navigation, organized by type. Part IV Celestial Navigation, contains techniques, examples and problems and a chapter on sight reduction. Part V
Time sight is a general method for determining longitude by celestial observations using a chronometer; these observations are reduced by solving the navigational triangle for meridian angle and require known values for altitude, latitude, and declination; the meridian angle is converted to local hour angle and compared with Greenwich hour angle.
Two sample pages of the 2002 Nautical Almanac published by the U.S. Naval Observatory. A nautical almanac is a publication describing the positions of a selection of celestial bodies for the purpose of enabling navigators to use celestial navigation to determine the position of their ship while at sea.
A New and Accurate Method of Finding a Ship's Position at Sea, by Projection on Mercator's Chart, by Capt. Thomas H. Sumner, 2nd.Ed. 1845 Plot of Sumner's calculated positions in 1837 [4]: 56 Orthographic projection showing approximate position of the subsolar point and part of the circle of equal altitude at 10 am GMT 17 December 1837
It was discovered by the American sea-captain Thomas Hubbard Sumner in 1837, published in 1843 and is the basis of an important method in celestial navigation. Discovery of the circle of equal altitude - A New and Accurate Method of Finding a Ship's Position at Sea, by Projection on Mercator's Chart , by Capt. Thomas H. Sumner, July 1843 ...
It is composed of three reference points on the celestial sphere: P is the Celestial Pole (either North or South). It is a fixed point. Z is the observer's zenith, or their position on the celestial sphere. X is the position of a celestial body, such as the sun, moon, a planet, or a star.
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