marked as Certified Chronometer or Officially Certified Chronometer. Outside Switzerland, equivalent bodies, such as the Japan Chronometer Inspection Institute...

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...

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...

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

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...

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

Contrôle officiel suisse des Chronomètres (COSC), the Official Swiss Chronometer Testing Institute, is the institute responsible for certifying the accuracy...

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

An observatory chronometer is a timepiece that has passed stringent testing and a slate of accuracy tests. Thus, the "observatory trial" developed as...

participate in domestically mass-producing chronometers. Hamilton was provided with two Swiss Ulysse Nardin marine chronometers to examine. Hamilton successfully...