December 2, 2019


My brother just offered me this book named Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His time, by Dava Sobel.

ISBN: 9780802714626

Anyone alive in the eighteenth century would have known that “the longitude problem” was the thorniest scientific dilemma of the day—and had been for centuries. Lacking the ability to measure their longitude, sailors throughout the great ages of exploration had been literally lost at sea as soon as they lost sight of land. Thousands of lives, and the increasing fortunes of nations, hung on a resolution.

The scientific establishment of Europe—from Galileo to Sir Issac Newton—had mapped the heavens in both hemispheres in its certain pursuit of a celestial answer. In stark contrast, one man, John Harrison, dared to imagine a mechanical solution—a clock that would keep precise time at sea, something no clock had ever been able to do on land. Longitude is a dramatic human story of an epic scientific quest and Harrison’s forty-year obsession with building his perfect timekeeper, known today as the chronometer. Full of heroism and chicanery, it is also a fascinating brief history of astronomy, navigation, and clock-making, and opens a new window on our world.

John Harrison

This book is fantastic, and tells the story of John Harrison, who was a self-educated carpenter and clock maker who invented the marine chronometer, solving the problem of calculating longitude while at sea.

John Harrison

Poor Harrison only received recognition and the promised award toward the end of his life.

I loved it!

I had so much pleasure reading it, couldn’t put it aside even for one moment.

I’ve learned many things regarding this story, I wouldn’t have imagined the struggles these pioneers had to accurately create a marine watch capable of calculating the current longitude.

Going from this watch:


to this watch:


to this masterpiece, what a beauty:



Now I just want to go and visit the Greenwich Museum and see them with my own eyes.

You should definitely read it!


Alexandre Grison - // - @algrison