John Harrison
Carpenter and clock-maker, invented Marine chronometer

Born
March 24th, 1693
331 years ago
Died
1776
249 years ago — 83 years old
Category
Scientists & Innovators
Country
United Kingdom
Links & References
An English carpenter and clock-maker made significant advancements in horology. Developed the marine chronometer, a device that greatly improved navigation at sea by allowing sailors to determine their longitude. Spent several decades perfecting the design and construction of marine timekeepers, resulting in the H4 chronometer, which successfully demonstrated its accuracy during a transatlantic voyage. His contributions to timekeeping were crucial in solving the problem of navigation while at sea, transforming maritime travel and exploration.
Invented the marine chronometer
Developed H4 chronometer
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