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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 ...
A Negus chronometer went with Robert Peary to the North Pole. Another was with Richard E. Byrd at the south Pole. [9] When John Mercer Brooke was on the North Pacific Exploring and Surveying Expedition in 1852, he said the best chronometer on the expedition proved to the one made by T. S. Negus and Company, which was purchased by the government ...
The Hughes family were originally clockmakers in the East End of London who progressed into supplying sextants and marine chronometers to ships coming into the River Thames. In 1712 Thomas Hughes became a member of the Worshipful Company of Clockmakers at the age of 26 and was elected as Master of the Worshipful Company of Clockmakers in 1742 ...
The frame of a sextant is in the shape of a sector which is approximately 1 ⁄ 6 of a circle (60°), [2] hence its name (sextāns, sextantis is the Latin word for "one sixth"). "). Both smaller and larger instruments are (or were) in use: the octant, quintant (or pentant) and the (doubly reflecting) quadrant [3] span sectors of approximately 1 ⁄ 8 of a circle (45°), 1 ⁄ 5 of a circle (72 ...
Thomas moved to Liverpool to continue working as a watchmaker in 1843, and thence to London in 1854, to buy a one-way ticket to the USA, in search of new and better prospects. Seeing a chronometer in the window of John Fletcher (chronometer makers), he changed his mind about the USA, asking for work and being hired on the spot. [3]
This Clock is to be the best specimen that can be produced of modern skill in clock-making, and is intended to furhish the Merchants and Captains with the most accurate record of time in the City of London. It is to be made by Mr. Dent, the Clock and Chronometer Maker, under the direction of the Astronomer Royal, Professor Airy.
A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.
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 ...
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