
Parallel stories: 18th century Harrison builds the marine chronometer for safe navigation at sea; 20th century Gould is obsessed with restoring it.
Michael GambonJohn Harrison
Jeremy IronsRupert Gould
Ian HartWilliam Harrison (Adult)
Andrew ScottJohn Campbell
Bill NighyLord Sandwich
Gemma JonesElizabeth Harrison
John WoodSir Edmund Halley
Anna ChancellorMuriel Gould
Brian CoxLord Morton
Samuel WestNevil Maskelyne
Ian McNeiceDr. Bliss
Jonathan CoyAdm. Sir Cloudsley ShovellChristopher HodsolCapt. AinsleyLiam JenningsWilliam Harrison (Young)
Peter VaughanGeorge Graham