"An Useful guideline about the heritage of British watchmaking. Horology supporters of all concentrations are certain to search out price here." 6 miles, or 55.7 km) at the end of a 6 months’ voyage. (The geographical mile is described as just one moment of arc together the Earth’s equator; Evaluate https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/