On 13 October 1884 Greenwich, in London was established as the Universal Time meridian of longitude - from which all World time zones are based. There are an infinite number of possible meridians, and any one of these could have been chosen. However, the Greenwich Meridian was pre-eminent because it had already been adopted by both the UK and USA and was therefore being used by 72% of the world's shipping.
Find books on longitude in Mathematical Geography 526.
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