For centuries, sailors could calculate latitude but had no reliable way to determine longitude, making ocean voyages dangerously uncertain. Dava Sobel tells the remarkable true story of John Harrison, the self-taught English clockmaker who devoted his life to creating a timepiece accurate enough to solve the problem at sea. His achievement brought him into conflict with powerful astronomers and institutions that favoured other methods. Combining science, biography and maritime history, this concise account captures the persistence, ingenuity and rivalry behind one of navigation’s greatest breakthroughs.
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