Longitude

Michael Gambon

John Harrison

Jeremy Irons

Rupert Gould

Gemma Jones

Elizabeth Harrison

Anna Chancellor

Muriel Gould

Emma Kay

Laura Gurney

Barbara Leigh-Hunt

Dodo Gould

Peter-Hugo Daly

John Jefferies

Alec McCowen

Sir Frank Dyson

Kevin Hudson

Lieutenant (uncredited)

T. P. McKenna

Edmund Burke

Peter Cartwright

Army Doctor

Alfred Burke

Rear Admiral

Jonathan Coy

Admiral Clowdisley

Christopher Hodsol

Captain Ainsley

Samuel West

Nevil Maskelyne

Clare Lawrence-Moody

Staff Nurse

Ian McNeice

Dr. Bliss

Clare McCarron

Nurse

Ian Hart

William Harrison

John Nettleton

Minister for the Navy

Bill Nighy

Lord Sandwich

Brian Cox

Lord Morton

Nigel Davenport

Sir Charles Pelham

Liam Jennings

Young William

John Leeson

BBC Producer

Joe Williams

Cecil Gould

Geoffrey Hutchings

Estate Manager

Nick Reding

Captain Campbell

John Wood

Edmund Halley

Peter Penry-Jones

Surgeon

Charles Edwards

Lt. Seward

David Wood

Ditton

Clive Francis

Captain Digges

Mark Tandy

Whiston

Stephen Fry

Sir Kenelm Digby

Steven Alvey

Learmouth

Tobias Menzies

Halley's Secretary

Ben Jones

Lt. Williams

Gary Waldhorn

Commodore Forrest

Robert Demeger

Observatory Porter

Colin McCormack

Inn Landlord

Sophie Millett

Dyson's Secretary

Peter Vaughan

George Graham

Daragh O'Malley

Captain Bourke

Sarah Badel

Society Lady

Phil Dix

Lt. Bandelwine

Frederick Warder

Bosun

Steve Morphew

Marine

Stephen Simms

James Harrison

Frank Finlay

Admiral Wagner

Sasha Hails

BBC Researcher

Cliff Parisi

Lt. Draper

John Normington

Mr. Greene

Rupert Baker

Lt. Bertie

Andrew Scott

John Campbell

Pip Torrens

Captain Lindsay

John Standing

Captain Proctor

Frederick Treves

Governor

Rose Keegan

Amy

Charles Gray

Admiral Balchen

Hugh Simon

Doctor

Trevor Cooper

Roger Wills

Rebecca Clay

Observatory Assistant

William Scott-Masson

Lt. Knorvler

Richard Janes

Young Assistant

William Thomas

Arthur Mason

Faith Kent

Lady Curator

Roger Lloyd Pack

Captain Man

Lucy Akhurst

Grace Ingram

Nicholas Rowe

King George

Ian Burfield

Jos Killick

Heike Makatsch

Queen Charlotte

John Quentin

Dr. Bradley

John Quayle

Dr. Demainbray

Michael Cochrane

Solicitor

James Bradshaw

Callboy