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Checked October 11, 2026
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Overview
The fascinating story of John Harrison who, in the 18th century, believed he could make a clock that would work on board a ship—and so solve the problem of finding longitude at sea.
Cast
Michael GambonJohn Harrison
Jeremy IronsRupert Gould
Gemma JonesElizabeth Harrison
Anna ChancellorMuriel Gould
Emma KayLaura Gurney
Barbara Leigh-HuntDodo Gould
Peter-Hugo DalyJohn Jefferies
Alec McCowenSir Frank DysonSeasons and episodes
1 season2 episodes
Miniseries
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E1 Part 1
When the British Parliament creates an award of £20,000 to whoever can come up with a solution for determining longitude at sea, a carpenter-turned-clockmaker, John Harrison, begins his experiments to build an accurate timepiece unaffected by sea travel. His main obstacles are lack of money, a judgment Board convinced that the answer lies in astronomy and not clocks, and the mechanics of the clock itself.
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E2 Part 2
Rallying after sickness to prove the integrity of their marvelous seafaring chronometers, the Harrisons still had to fight for official recognition, and Gould's restoration of the Harrison clockworks provides a fitting coda to this exceptional story about the thrill of discovery and the tenacity of remarkable men.
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