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...

term chronometer is also used to describe a marine chronometer used for celestial navigation and determination of longitude. The marine chronometer was...

The Omega Marine Chronometer was the first quartz wristwatch ever to be awarded certified status as a marine chronometer. The watch was made by Omega SA...

March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of calculating...

A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals...

Model 21 marine chronometers for the US Navy, 1,500 for merchant shipping, and 500 for the US Army during the war. The Model 22 Chronometer Watch followed...

Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during...

English chronometer maker, London, pocket and marine chronometer. George Margetts (1748–1808), English chronometer maker, London, pocket and marine chronometer...

calculate the time at zero longitude (see Greenwich Mean Time). Reliable marine chronometers were unavailable until the late 18th century and not affordable until...

following John Arnold's earlier work, further simplified the process of marine chronometer production, making them available to the general public. He is also...

Switzerland. The company became known for manufacturing highly accurate marine chronometers and complicated precision exclusive timepieces used by over 50 of...

synchronized with the ship's marine chronometer. The use of a hack watch makes it easier to take sights, as the chronometer is normally in a fixed position...

Harrison built a succession of accurate timepieces, introducing the term chronometer. The electric clock, invented in 1840, was used to control the most accurate...

seconds per day. The most accurate balance wheel timepieces made were marine chronometers, which were used on ships for celestial navigation, as a precise...

gimbal. The rate of a mechanical marine chronometer is sensitive to its orientation. Because of this, chronometers were normally mounted on gimbals,...

1970 by Pulsar. In 1974 the Omega Marine Chronometer was introduced, the first wrist watch to hold Marine Chronometer certification, and accurate to 12...

quartz watches are chronometer-certified by the COSC. These COSC chronometer-certified movements can be used as marine chronometers to determine longitude...

mastery and improvement of the clock and chronograph, above all of the marine chronometer, in which he carried forward the pioneering work of John Harrison...

other hazards. Practical celestial navigation usually requires a marine chronometer to measure time, a sextant to measure the angles, an almanac giving...

Chronometers were formerly used for the accurate determination of longitude by ships at sea. By measuring the time of local solar noon compared to the...

London. Not until the 18th century did John Harrison come up with a marine chronometer that significantly improved on the stability of the hourglass at sea...

Kendall K2 marine chronometer by Adams. The K2 was the third precision marine chronometer made after the H4, designed by John Harrison. The chronometer was taken...

Maskelyne; and for the chronometers developed by the Yorkshire carpenter and clock-maker John Harrison. Harrison built five chronometers over more than three...

A nautical chronometer made by Thomas Earnshaw (1749–1828), and once part of the equipment of HMS Beagle, the ship that carried Charles Darwin on his...

Thomas Mercer Chronometers is a British company specialising in the design and production of bespoke chronometers. The story begins with John Harrison...

longitude at sea, solved in practice by John Harrison's invention of the marine chronometer. However the accuracy of the lunar theory was low, due to the perturbing...

positions are calculated. Before the 18th-century development of the marine chronometer by John Harrison and the lunar distance method, dead reckoning was...

spring used in mechanical watches, alarm clocks, kitchen timers, marine chronometers, and other timekeeping mechanisms to control the rate of oscillation...

method of determining longitude (before John Harrison developed the marine chronometer method of determining longitude, the main theory was the Method of...

marine chronometers were developed to a very high degree of accuracy for use in maritime navigation. To test the accuracy of such marine chronometers...