Contrary to popular belief, longitude is not a defined spot on the world's surface but rather an imaginary line.Dava Sobel
The clock was crucial. With only chronometers, the mariners could maintain their east-west position.Dava Sobel
Naturally, judging longitude was always risky, especially for sailors. Their lives depended on it.Dava Sobel
It was always a race against time, a test of endurance, and a matter of survival.Dava Sobel
Latitude is simple, Longitude - difficult. However, one wouldn't work without the other.Dava Sobel