Sailors worked out a ship's position... No, that could give them only latitude. Accurate longitude measurements at sea are a different problem, ultimately sol

Sailors worked out a ship's position... No, that could give them only latitude. Accurate longitude measurements at sea are a different problem, ultimately solved only by the invention of a precision timepiece that was immune to motion. There's a great TV miniseries on how this came about: https://en.wikipedia.org/wiki/Longitude_%28TV_series%29 https://en.wikipedia.org/wiki/Longitude_%28TV_series%29