This person built five clocks of unparalleled sophistication over a thirty year period: H-1, H-2, H-3, H-4, and H-5. Each clock exists to this day, and the first three still run.
This person was a major proponent of the lunar-distance method for determining longitude. He was obsessed with discovering a solution to the longitude problem and wrote The British Mariner's Guide.
This person helped to build and test H-3, H-4, and H-5.
Admiral Sir Clowdisley
This person's shipwreck motivated the passage of the 1714 Longitude Act.
These people are famous astronomers who play a large role in the pre-history of this book. They not only struggle and fail to solve the problem of longitude, but they lay out the path toward a lunar-distance method that was championed by later astronomers.
This person was a British royal astronomer...
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