The starting point for measuring longitude. It runs through Greenwich, London , UK, and divides Earth into Eastern Hemisphere (0° to 180° east) and Western Hemisphere (0° to 180° west).
The Earth is wrapped in an invisible grid of lines known as latitude and longitude. While latitude tells us how far north or south we are from the Equator, longitude determines our east-west position. At the heart of this system lie two critical, opposing lines: the and the Antimeridian . Together, they form a great circle that divides the Earth into the Eastern and Western Hemispheres. The Prime Meridian: The Starting Point (0°) antimeridian and prime meridian
Website * antimeridian. noun. imaginary line of 180 degrees longitude, completing the circle of longitude of the prime meridian. * National Geographic Society Prime Meridian - National Geographic Education The starting point for measuring longitude
Longitude is the measurement east or west of the prime meridian. Longitude is measured by imaginary lines that run around Earth ve... National Geographic Society Antimeridian The Antimeridian is the +180°/-180° line of longitude, exactly opposite the Prime Meridian (0°). It is often used as the basis for... Pacific Islands Ocean Observing System (PacIOOS) What is the Prime Meridian, and why is it in Greenwich? Royal Observatory Greenwich is famous around the world as the home of the historic Prime Meridian. Just as the equator separates t... Royal Museums Greenwich Prime meridian (Greenwich) - Wikipedia The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in... Wikipedia Video: Prime Meridian | Definition & Map - Study.com The Prime Meridian is important because it serves as the standard for all time zones. Because of this, it has been a crucial part ... Study.com 6 sites Prime Meridian - Dataset - Catalog Jan 26, 2025 — While latitude tells us how far north or
The Prime Meridian, arguably the most famous line of longitude, is the line of zero degrees longitude (0°). Historically, its location was a matter of intense debate and national competition. For centuries, maritime powers established their own "prime" meridians based on their capital cities, resulting in a chaotic patchwork of maps that hindered international coordination. This confusion was largely resolved in 1884 at the International Meridian Conference in Washington, D.C., where delegates voted to establish the meridian passing through the Royal Observatory in Greenwich, London, as the global standard. This decision was not merely political; it was practical. At the time, the United States had already chosen Greenwich as the reference for its national time system, and a vast majority of the world's commerce relied on Greenwich-based nautical charts.