Sea Clocks: The Story of Longitude [Book]

Sailors knew how to measure latitude, their location north or south of the equator, but they could not measure longitude, their location east or west of their home port. Because of this, many lives were lost worldwide. The key to solving this problem lay in devising a clock that could keep absolutely accurate time while at sea, unaltered by rough water or weather conditions.

Sea Clocks: The Story of Longitude

Thomas Earnshaw and the Marine Chronometer

History of longitude - Wikipedia

Lost at Sea: The Search for Longitude (TV Movie 1998) - IMDb

An illustrated version of a modern classic

This Marine Chronometer Was the First Global Positioning System

The Greenwich longitude exhibition on tour, History of science

John Harrison's Marine Chronometers – London, England - Atlas Obscura

John Harrison and the Longitude Problem Naval History Magazine - October 2019 Volume 33, Number 5

Book review: Dava Sobel's “Longitude”

Book Review: The genius who solved the longitude problem - SAFETY4SEA

F】 Book Review: Longitude By Dava Sobel