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4. Dead reckoning, longitude, and time
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What was the state of the mathematical science of navigation at the end of the 17th century? ‘Dead reckoning, longitude, and time’ describes the different techniques of sailing—plane sailing, Mercator sailing, middle-latitude sailing, and great-circle sailing—employed to set and reckon a course in the 17th‐18th centuries. Although longitude could be found by dead reckoning, a more reliable method was required to improve navigation. The Royal Observatory, founded in 1675, and the Board of Longitude, which followed in 1714, were crucial to the emergence of longitude methods by chronometers and lunar distances (or ‘lunars’). The work of key characters such as John Hadley and John Harrison is described.
Title: 4. Dead reckoning, longitude, and time
Description:
What was the state of the mathematical science of navigation at the end of the 17th century? ‘Dead reckoning, longitude, and time’ describes the different techniques of sailing—plane sailing, Mercator sailing, middle-latitude sailing, and great-circle sailing—employed to set and reckon a course in the 17th‐18th centuries.
Although longitude could be found by dead reckoning, a more reliable method was required to improve navigation.
The Royal Observatory, founded in 1675, and the Board of Longitude, which followed in 1714, were crucial to the emergence of longitude methods by chronometers and lunar distances (or ‘lunars’).
The work of key characters such as John Hadley and John Harrison is described.
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