Greenwich prime meridian

The equator, or latitude 0, separates the northern and southern hemispheres of the globe. Defined as the middle point of the two geographic poles, there’s no way anyone could argue about its location. However the meridian – longitude 0 – has no scientific definition so could basically be anywhere you like on the planet. The most widely accepted meridian was defined at the Royal Observatory in Greenwich, London. However, even here the meridian has shifted about a bit. 18th century astronomer James Bradley’s meridian is still shown on UK maps today, but has otherwise mostly been forgotten. The…

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