![]() ![]() All countries and regions measure their time zones according to UTC. Just as the prime meridian is the standard for longitude, UTC is the standard for time. UTC never changes for daylight savings or anything else. The prime meridian also sets Coordinated Universal Time (UTC). The Greenwich Meridian became the international standard for the prime meridian. They chose the meridian passing through the Royal Observatory in Greenwich, England. President Chester Arthur in 1884, representatives from 25 countries agreed to pick a single, standard meridian. Finally, at an international convention called by U.S. Even different parts of the same country published materials based on local meridians. Cartographers in China published maps with 0° longitude running through Beijing. France published maps with 0° longitude running through Paris. Different countries published maps and charts with longitude based on the meridian passing through their capital city. ![]() Governments did not always agree that the Greenwich meridian was the prime meridian, making navigation over long distances very difficult. However, there is an international agreement that the meridian that runs through Greenwich, England, is considered the official prime meridian. ![]() Any line of longitude (a meridian) can serve as the 0° longitude line. ![]() The prime meridian is arbitrary, meaning it could be chosen to be anywhere. The prime meridian is the line of 0° longitude, the starting point for measuring distance both east and west around Earth. ![]()
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