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The history of the Observatory competes with the history it created. Learn why the discovery of longitude was so important, especially at sea, and why such huge rewards were offered for its discovery. And how this made the invention of clocks possible. Learn the difference between time and space or whether they are really the same thing? Of course, no visit would be complete without standing with one foot in the east and one in the west over the GMT line.  3 minutes Greenwich  DLR