>For the deep historians, [this](https://gutenberg.org/cache/epub/17759/pg17759-images.html) is the proceedings of an international conference in October 1884, in Washington DC, USA, called at the request of the President of the USA for the purpose of fixing the “Prime Meridian” (i.e. zero longitude). There were many different longitude references back then, but the bulk of maritime tonnage used Greenwich as their reference (much to the annoyance of the French, who used Paris as their reference). The final adoption of Greenwich was on October 22, 1884, and at the same time, the original global time zones were also established.
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