Greenwich meridian chosen as the official prime meridian.
From the 17th century onwards Greenwich, home to the national observatory, had been the centre for the study of time as well as the skies, the link being the need for accurate timekeeping for navigation. Accordingly, a meridian at the Greenwich Observatory(originally the site of Greenwich Castle, constructed by the Duke of Gloucester, in 1433) was set, by the British, as the zero point of reference for determining time and longitude.
Greenwich Mean Time was first adopted across the island of Great Britain by the Railway Clearing House in 1847 to standardise train timetables, and by almost all railway companies by the following year. By the end of 1880 GMT had been legally adopted throughout the island of Great Britain.
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