Longitude

Ian Hart

as William Harrison

Michael Gambon

as John Harrison

Jonathan Coy

as Adm. Sir Clowdisley Shovell

Jeremy Irons

as Rupert Gould

Peter Cartwright

as Army Doctor

Gemma Jones

as Elizabeth Harrison

Christopher Hodsol

as Capt. Ainsley

Anna Chancellor

as Muriel Gould

Christopher Hodsol

as Captain Ainsley

Stephen Fry

as Sir Kenhelm Digby

Emma Kay

as Laura Gurney

Samuel West

as Nevil Maskelyne

Ian McNeice

as Dr. Bliss

Bill Nighy

as Lord Sandwich

Brian Cox

as Lord Morton

Barbara Leigh-Hunt

as Dodo Gould

Peter-Hugo Daly

as John Jefferies

Gary Waldhorn

as Commodore Forrest

Tim McInnerny

as Christopher Irwin

Hugh Simon

as Doctor

Alfred Burke

as Rear Admiral

Michael Cochrane

as Waddington

Nigel Davenport

as Sir Charles Pelham

Roger Lloyd Pack

as Capt. Man (uncredited)

Tobias Menzies

as Halley's Secretary (uncredited)