The Harrison Clocks

A recent post on the Two Nerdy History Girls blog prompted me to remember the wonderful book “Longitude” by Dava Sobel chronicling the history of John Harrison and his lifelong pursuit to develop an accurate chronometer.

In 1714, the Royal Navy had a problem.  Although it was a rather simple procedure to determine the latitude of a ship at sea (by sighting angle of the the sun at noon or Polaris, the North Star, at night), it was exceedingly difficult to determine a ship’s longitude.  After several maritime disasters resulting from faulty navigation, Parliament passed the Longitude Act which offered monetary rewards for methods to determine longitude at sea.

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