What is so special about the prime meridian?

Written by Editorial Team | Last Updated: August 2026

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 navigation measurements are calculated. Standing astride this imaginary line allows travelers to physically place one foot in the Eastern Hemisphere and the other foot in the Western Hemisphere simultaneously.

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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 is geographically located at longitude zero degrees (0∘), running from the North Pole to the South Pole.

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