In order to keep time accurately, we have always had to set our clocks by the ticks of a better one. Until the 1950s, the best were those set by astronomers based on the position of the sun in the sky ...
London grew rapidly in the 19th century, becoming the world's largest city at the time. Since the 19th century [9] the name "London" has referred to the metropolis around the City of London, historically split among the counties of Middlesex, Essex, Surrey, Kent and Hertfordshire. [10]
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New Scientist: Ruth Belville: How the Greenwich Time Lady kept London ticking