How does math guide our ships at sea? - George Christoph
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Napier's bones (or Napier's rods) and logarithms: http://www.youtube.com/watch?v=ShjoKnSm9ds
Logarithms were introduced by John Napier in the early 17th century as a means to simplify calculations. They were rapidly adopted by navigators, scientists, engineers, and others to perform computations more easily, using slide rules and logarithm tables. http://en.wikipedia.org/wiki/Logarithm
A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece. http://en.wikipedia.org/wiki/Clock
A sextant is an instrument used to measure the angle between any two visible objects. Its primary use is to determine the angle between a celestial object and the horizon which is known as the object's altitude. Making this measurement is known as sighting the object, shooting the object, or taking a sight and it is an essential part of celestial navigation. http://www.mat.uc.pt/~helios/Mestre/Novemb00/H61iflan.htm
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