Meridian Longitude Jun 2026

To understand the system, one must first distinguish the two core components:

To understand meridian longitude, it is helpful to break down its two components: Longitude ( meridian longitude

Meridian longitude is more than a line on a map—it is the foundation of global navigation, timekeeping, and our shared understanding of location. From ancient astronomers to modern GPS, the quest to measure how far east or west we are has driven innovation and connected the world. The next time you look at a map, remember that every vertical line tells a story of geometry, history, and human ingenuity. To understand the system, one must first distinguish

For longitude to be measurable, a zero point is necessary. Today, that zero point is the , which runs through the Royal Observatory in Greenwich, England . Established by international agreement in 1884, the Greenwich Meridian is designated as 0° longitude . For longitude to be measurable, a zero point is necessary