
The film chronicles the life of John Harrison, an 18th‑century self‑taught clockmaker who set out to build a marine chronometer that could keep accurate time aboard a ship. His relentless experiments and ingenuity aimed to give sailors a reliable way to determine longitude at sea, ultimately reshaping navigation.
Does Longitude have end credit scenes?
No!
Longitude does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Longitude, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Jeremy Irons
Rupert Gould

Tobias Menzies
Halley's Secretary (uncredited)

Frank Finlay
Admiral Wagner

Michael Gambon
John Harrison

Alec McCowen
Sir Frank Dyson

Andrew Scott
John Campbell

Gemma Jones
Elizabeth Harrison

Tim McInnerny
Christopher Irwin

Stephen Fry
Sir Kenhelm Digby

Anna Chancellor
Muriel Gould

Peter Vaughan
George Graham

John Standing
Captain Proctor

John Wood
Edmund Halley

Charles Gray
Admiral Balchen

Roger Lloyd Pack
Capt. Man

Peter-Hugo Daly
John Jefferies

Emma Kay
Laura Gurney

Barbara Leigh-Hunt
Dodo Gould

Gary Waldhorn
Commodore Forrest
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