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The Royal Observatory, Greenwich is one of the most important scientific sites in the world. As well as being the defined location of zero degrees longitude, it is also the home of Greenwich Mean Time. As well as various exhibitions relating to astronomy, the observatory houses displays regarding the determination of longitude (the navigation problem that the observatory was set up to solve), and which was eventually solved by watchmaker John Harrison. http://www.nmm.ac.uk/server/show/conWebDoc.13496

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