Where is the prime meridian located?

The prime meridian is located at the longitude of 0 degrees and serves as the reference line for Greenwich Mean Time. It was established at the International Meridian Conference held in Washington, D.C., in 1884. Greenwich, located in London, England, was chosen as the location of the prime meridian due to its long history of navigation and astronomy, particularly because of the Royal Observatory established there. This decision made Greenwich the point from which all other longitudes are measured.

The significance of the prime meridian lies in its role in helping to define time zones around the world and aiding in global navigation. By establishing a uniform starting point for measuring longitude, it facilitates easier communication and coordination internationally.