SEA CLOCKS: The Story of Longitude

Sea Clocks: The Story of Longitude: Borden, Louise, Blegvad, Erik

Longitude Summary

Longitude — The Glass Universe

Check It Out: Longitude by Dava Sobel

John Harrison (1693-1776)

John Harrison and the Quest for Longitude: The Story of Longitude

John Harrison: Seafaring revolutionizer

Early Sea Clock Experiments

Ships, Clocks, and Stars: The Quest for Longitude