How did the whole world end up agreeing on what time it is?
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At the [International Meridian Conference](https://en.wikipedia.org/wiki/International_Meridian_Conference?wprov=sfti1) held in 1884 in Washington DC, delegates from 26 countries met and decided that the imaginary line running through Greenwich in the UK would serve as the point for 0° longitude and everyone would offset their time from there.
Greenwich was selected because they had already figured out how to standardize the UK’s time against reference clocks for the sake of more efficient rail travel.
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