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...

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

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...

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