Greenwich Meridian

The Greenwich Meridian, also known as the Prime Meridian, is the starting point for measuring longitude lines on Earth. It runs through the Royal Observatory in Greenwich, London, and divides the planet into eastern and western hemispheres. Established in 1884, it helps us determine exact locations and time zones worldwide. When you see "0° longitude," you're looking at the Greenwich Meridian, which serves as a global reference point for navigation, mapping, and timekeeping.