These clocks, because of their technical innovations, achieved unprecedented accuracy and are the direct link to H-1.At a dinner at 10 Downing Street, astronaut Neil Armstrong, not long after his walk on the moon, gave a toast to Englishman John Harrison, inventor of the marine chronometer. "You, ladies and gentlemen, started us on our journey." This clock is part of the story of John Harrison's relentless quest to develop a practical method of determining longitude at sea, using the time difference principle. By having a reliable timekeeper set to the time at a known longitude, for example, a ship's home port, and comparing this to local time, which could be accurately determined by observation of the sun and stars, the time difference could then be converted to an east or west distance from the fixed geographical point that the timekeeper represented. Not being able to fix location accurately was the cause of much loss of shipping, cargoes and lives, and a major impediment to economic growth. Made in response to The Longitude Act of 1714, Harrison achieved extraordinarily accurate timekeeping on land and then set about making a portable version, H-1, the world's first successful marine timekeeper. The eventual outcome was H-4 the acknowledged winner of the Longitude Prize.
These clocks, because of their technical innovations, achieved unprecedented accuracy and are the direct link to H-1.