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For those who haven't read it in detail, the history of the invention and refinement of the marine chronometer is fascinating: https://en.wikipedia.org/wiki/Marine_chronometer

If visit Greenwich Observatory you'll see Harrison sea clocks H1, H2, and H3.

I had the luck (and honor!) to meet a volunteer guide - Stephen - that knew everything about clocks and explained it perfectly.

When you meet him, say hello :-). My kid barely spoke English and Stephen had the patience and virtue to answer everything with a smile.

Best guide I ever met.

It is a wonderful place. The walk up the hill at my advance age was a challenge, but well worth it!