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In October of 1884, at the request of U.S. President Chester Arthur, 41 delegates from 25 nations met in Washington D.C. for the International Meridian Conference. There it was decided by all that the Greenwich Meridian will be the official Prime Meridian due to its popularity.

John Flamsteed (1646-1719), was appointed Astronomer Royal by King Charles 2 in 1675 and given permission to build an observatory in Greenwich in South-East London on the site of the Prime Meridian. The observatory is still there and is open to visitors where the line is clearly marked on the ground. It is possible to stand on the site with one foot in the Eastern Hemisphere and the other in the Western Hemisphere.

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14y ago
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12y ago

greenwich

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George Airy

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Q: Who decided that the Greenwich Meridian was the Prime Meridian?
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