The Story of Clocks: The Secret History of Time | Deep Sleep

John Harrison was an English carpenter and self taught clockmaker who helped solve one of the most dangerous problems in 18th century navigation: determining longitude at sea. Sailors could calculate latitude using the Sun and stars, but longitude required knowing the exact time difference between a ship’s location and a fixed reference point like Greenwich. To encourage a solution, Britain passed the Longitude Act of 1714, offering huge rewards to anyone who could produce a reliable method. Har