The Prime Meridian is an imaginary line that runs from the North Pole to the South Pole, dividing the Earth into the Eastern and Western Hemispheres. It is located at 0 degrees longitude and serves as the starting point for measuring longitude. This line passes through the Royal Observatory in Greenwich, England, which is why it is often referred to as the Greenwich Meridian. Established in 1884, the Prime Meridian helps in navigation and timekeeping. It is essential for creating time zones around the world, with each zone typically 15 degrees apart. This system allows us to coordinate activities globally, making travel and communication more efficient.