Board of Longitude

Board of Longitude

The Board of Longitude was the popular name for the Commissioners for the Discovery of the Longitude at Sea. It was a British Government body formed in 1714 to administer a scheme of prizes intended to encourage innovators to solve the problem of finding longitude at sea.



Navigators and scientists had been working on the problem of not knowing a ship's longitude. The establishment of the Board of Longitude was motivated by this problem and by the 1707 grounding of four ships of Vice-Admiral Sir Cloudesley Shovell's fleet off the Isles of Scilly, resulting in heavy loss of life. Established by the Longitude Act in 1714, the Board gathered the greatest scientific minds of the day to work on the problem, including Sir Isaac Newton, and put up prizes for those who could demonstrate a working device or method.

The main longitude prizes were:

  • £10,000 for a method that could determine longitude within 60 nautical miles (111 km)
  • £15,000 for a method that could determine longitude within 40 nautical miles (74 km)
  • £20,000 for a method that could determine longitude within 30 nautical miles (56 km).

In addition, the Board had the discretion to make awards to persons who were making significant contributions to the effort or to provide financial support to those who were working towards a solution. The Board could also make advances of up to £2,000 for experimental work deemed promising.[1] Under this heading, the Board made many lesser awards, including some awards in total £5000 made to John Harrison before he received his main prize, an award of £3000 to the widow of Tobias Mayer, whose lunar tables were at the basis of the lunar data in the early decades of the Nautical Almanac, £300 to Leonhard Euler for his (assumed) contribution to the work of Mayer, £50 each to Richard Dunthorne and Israel Lyons for contributing methods to shorten the calculations connected with lunar distances, and awards made to the designers of improvements in chronometers.

Even though many tried their hand at winning the main prize, for decades none were able to come up with a practical solution to the problem. The Board recognised that any serious attempt would be based on the recognition that the earth rotates through 15° of longitude every hour. The comparison of time between a known place (e.g., Greenwich) and the local time would determine longitude. Since local apparent time could be determined with some ease, the problem centred on finding a means of determining the time at a known place.

For details of the efforts towards determining the longitude, see History of longitude.

End of the Board's mandate

For many decades a sufficiently accurate chronometer was prohibitively expensive. The lunar distance method was used by mariners either in conjunction with or instead of the marine chronometer. However, with the expectation that accurate clocks would eventually become commonplace, John Harrison showed that his method was the way of the future. However the board, to its discredit, never awarded the prize to Harrison, nor anyone else.

With the significant problems considered as solved, the Board of Longitude was abolished by act of Parliament in 1828.


  1. ^ Taylor, E.G.R., The Haven-finding Art: A History of Navigation from Odysseus to Captain Cook, Hollis & Carter, London 1971, ISBN 0-370-01347-6

External links

Yacht foresail.svg Nautical portal

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Board of Longitude — Der Board of Longitude (engl. Längenausschuss) wurde 1714 vom britischen Parlament einberufen. Aufgabe des Gremiums aus Sachverständigen war das Erteilen von Forschungsaufträgen und Verleihen von Preisen für die Lösung des Längenproblems. Das… …   Deutsch Wikipedia

  • Longitude prize — The Longitude Prize was a reward offered by the British government through an Act of Parliament in 1714 for a simple and practical method for the precise determination of a ship s longitude. The prize was administered by the Board of… …   Wikipedia

  • Longitude — For Dava Sobel s book about John Harrison, see Longitude (book). For the adaptation of Sobel s book, see Longitude (TV series). Map of Earth Longitude (λ) Lines of longitude appear vertical with varying curvature in this projection, but are… …   Wikipedia

  • Longitude 131 Lodge Ayers Rock (Ayers Rock) — Longitude 131 Lodge Ayers Rock country: Australia, city: Ayers Rock (Yulara) Longitude 131 Lodge Ayers Rock Location Located a few minute drive from Ayers Rock Resort, 20 minutes from the Airport, tucked away in a secluded spot. Magnificent… …   International hotels

  • History of longitude — The history of longitude is a record of the effort, by navigators and scientists over several centuries, to discover a means of determining longitude. The measurement of longitude is important to both cartography and navigation. Historically, the …   Wikipedia

  • John Harrison — Infobox Scientist name = John Harrison |300px image width = 260px caption = P.L. Tassaert s half tone print of Thomas King s original 1767 portrait of John Harrison, located at the Science and Society Picture Library, London birth date = birth… …   Wikipedia

  • Nevil Maskelyne — For other people named Nevil Maskelyne, see Nevil Maskelyne (disambiguation). Rev. Dr Nevil Maskelyne Born 6 October 1732 …   Wikipedia

  • John Campbell (Royal Navy officer) — Infobox Military Person name=John Campbell lived=1720 1790 caption= nickname= placeofbirth=parish of Kirkbean, near Dumfries, Kirkcudbrightshire, Scotland placeofdeath=his house at Charles Street, Berkeley Square, London, England allegiance=Great …   Wikipedia

  • navigation — navigational, adj. /nav i gay sheuhn/, n. 1. the act or process of navigating. 2. the art or science of plotting, ascertaining, or directing the course of a ship, aircraft, or guided missile. [1520 30; < L navigation (s. of navigatio) a voyage.… …   Universalium

  • Harrison , John — (1693–1776) English horologist John Harrison was born at Foulby near Pontefract in Yorkshire, the son of a carpenter, a trade he originally took up himself. In the early 18th century exploration and colonial expansion was an important concern of… …   Scientists