The prime meridian offically passes through the Royal Observatory in London.
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The prime meridian is a line of longitude. It divides the Earth into two hemispheres, known as the Eastern and Western Hemispheres.
eastern and western
Eastern & Western Hemisphere.
The Loire River!!!
The Prime Meridian, which is at longitude ZERO degrees, and the International Date Line. The International Date Line is supposed to be at longitude 180 degrees, but it varies quite a distance for political reasons.