Chronometer trials from "summary" of Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time by Dava Sobel
Chronometer trials were the ultimate test of a timepiece's ability to keep accurate time at sea. The trials involved taking a chronometer on a voyage between two known points, such as from England to the West Indies and back. The idea was to compare the time shown on the chronometer with the time shown by the stars or by a reliable clock at the destination. During the voyage, the ship's crew would carefully monitor the chronometer and note any discrepancies between it and the true time. These discrepancies could then be used to ...
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