https://www.youtube.com/watch?v=ti9_WfFTSqw
https://youtube.com/playlist?list=PLJHLGBY4vXIz3mlgmozgobM43LQLdbY8a
https://www.imdb.com/title/tt0192263/?ref_=tt_ch
https://www.imdb.com/title/tt0192263/fullcredits?ref_=tt_ov_st_sm
https://www.rottentomatoes.com/m/longitude
https://www.usni.org/magazines/naval-history-magazine/2019/october/john-harrison-and-longitude-problem
https://www.rmg.co.uk/stories/topics/harrisons-clocks-longitude-problem
https://www.theguardian.com/science/2014/may/18/true-sea-shanty-story-behind-longitude-prize-john-harrison
http://www.solarnavigator.net/history/john_harrison.htm
https://youtu.be/3mHC-Pf8-dU
