Where exactly is the Prime Meridian?
The Prime Meridian is geographically located at longitude zero degrees (0∘), running from the North Pole to the South Pole. Its most famous and official physical marker is situated at the historic Royal Observatory in Greenwich, London, where a stainless steel strip and a projected laser beam split the courtyard to demarcate the exact division between the Eastern and Western Hemispheres. While historically anchored to Greenwich by international agreement, modern geodetic systems like WGS84 place the actual prime reference meridian slightly east of the historic transit circle due to modern satellite positioning refinements.
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The Prime Meridian is precisely defined as the line of longitude at zero degrees (0∘), which serves as the international reference point dividing the Earth into the Eastern and Western Hemispheres.
The prime meridian, historically established at the Royal Observatory in Greenwich, London, is special because it represents the arbitrary zero-degree line of longitude from which all other global geographic coordinates, time zones, and global naviga...