| 21. | The solution came from a scorned carpenter, John Harrison, who perfected a precision marine chronometer in 1760.
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| 22. | One was his first marine chronometer project.
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| 23. | His technical advances enabled the quantity production of Marine Chronometers for use on board ships from around 1782.
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| 24. | The spring-driven marine chronometer is a precision timepiece used aboard ship to provide accurate time for celestial observations.
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| 25. | To put this in chronological context, in 1762 John Harrison's marine chronometer first enabled accurate measurement of longitude.
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| 26. | A plaque stands at number 120 commemorating Thomas Earnshaw's invention of the Marine chronometer, which facilitated long-distance travel.
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| 27. | The 3?longitude error may be explained by Carteret sailing without the benefit of the new marine chronometer.
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| 28. | The "'Omega Marine Chronometer "'was the first quartz wristwatch ever to be awarded certified status as a marine chronometer.
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| 29. | The "'Omega Marine Chronometer "'was the first quartz wristwatch ever to be awarded certified status as a marine chronometer.
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| 30. | The observatory's primary mission was to care for the United States Navy's marine chronometers, charts, and other navigational equipment.
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