Longitude: Reparto
Michael Gambon
John Harrison
Jeremy Irons
Rupert Gould
Ian Hart
William Harrison (Adult)
Andrew Scott
John Campbell
Bill Nighy
Lord Sandwich
Gemma Jones
Elizabeth Harrison
John Wood
Sir Edmund Halley
Anna Chancellor
Muriel Gould
Brian Cox
Lord Morton
Samuel West
Nevil Maskelyne
Ian McNeice
Dr. Bliss
Jonathan Coy
Adm. Sir Cloudsley Shovell
Christopher Hodsol
Capt. Ainsley
Liam Jennings
William Harrison (Young)
Peter Vaughan
George Graham
Nigel Davenport
Sir Charles Pelham
Tim McInnerny
Christopher Irwin
John Standing
Capt. Proctor
Peter Cartwright
Army Doctor
Stephen Fry
Sir Kenelm Digby
Daragh O'Malley
Capt. Bourke
Cliff Parisi
Lt. Draper
Michael Cochrane
Waddington, Gould's solicitor
Tobias Menzies
Halley's Secretary
Charles Edwards
Lt. Seward
Pip Torrens
Capt. Lindsay
T. P. McKenna
Edmund Burke
Barbara Leigh-Hunt
Dodo Gould
Peter-Hugo Daly
John Jefferies
John Normington
Mr. Greene
Nicholas Rowe
King George
Roger Lloyd Pack
Capt. Man
Trevor Cooper
Roger Wills
Lucy Akhurst
Grace Ingram
Peter Penry-Jones
Surgeon
Mark Tandy
Whiston
Heike Makatsch
Queen Charlotte
William Thomas
Arthur Mason