How long was John Harrison's professional career, approximately?
5 years
10 years
20 years
25 years
Answer
John Harrison's professional career spanned approximately 10 years, during which he made significant contributions to the field of horology, particularly in the development of accurate marine timekeepers. His dedication and expertise in precision engineering were instrumental in solving the problem of determining longitude at sea, a crucial breakthrough that greatly enhanced navigation and safety in maritime travel.
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