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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 ...
Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century. It is an astronomical method of calculating the longitude at which a position line, drawn from a sight by sextant of any celestial body, crosses the ...
USS Constitution, also known as Old Ironsides, is a three-masted wooden-hulled heavy frigate of the United States Navy. She is the world's oldest commissioned naval warship still afloat. [ 9][ Note 1] She was launched in 1797, one of six original frigates authorized for construction by the Naval Act of 1794 and the third constructed.
USCGC Eagle (WIX-327), formerly the Horst Wessel and also known as the Barque Eagle, is a 295-foot (90 m) barque used as a training cutter for future officers of the United States Coast Guard. She is one of only two active commissioned sailing vessels in the United States military today, along with USS Constitution which is ported in Boston Harbor.
A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation . The estimation of this angle, the altitude, is known as sighting or shooting the ...
USS Constitution, the last of the original six frigates of the United States Navy still in commission Class overview Operators United States Navy Built 1794–1800 In service 1794–1881 In commission 1797–present Planned 6 Completed 6 Active 1 Lost 2 Retired 3 General characteristics (Constitution, President, United States) Class and type 44-gun frigate Tonnage 1,576 Displacement 2,200 tons ...
The circle of equal altitude, also called circle of position ( CoP ), is defined as the locus of points on Earth on which an observer sees a celestial object such as the sun or a star, at a given time, with the same observed altitude. It was discovered by the American sea-captain Thomas Hubbard Sumner in 1837, published in 1843 and is the basis ...
History. SS Constitution on a visit to Haifa on March 10, 1953. Commissioned in 1951, she started her long career sailing on the New York City - Genoa - Naples - Gibraltar route to Europe . Following service on American Export's "Sunlane" cruise to Europe in the 1950s and 1960s, the two ships sailed for American Hawaii Cruises and American ...
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