Meridian Longitude Page

Longitude isn’t just about distance; it’s the foundation of how we measure time. Because the Earth rotates 360° every 24 hours, it moves .

We apply similar coordinate systems to map the surfaces of Mars and the Moon. meridian longitude

Meridian Longitude: The Invisible Lines That Define Our World Longitude isn’t just about distance; it’s the foundation

The 180° meridian (located in the Pacific Ocean) is where East meets West. This line serves as the basis for the International Date Line . Longitude isn’t just about distance

In 1884, the International Meridian Conference met in Washington, D.C., and established the (passing through the Royal Observatory in Greenwich, London) as the world's official Prime Meridian. It is designated as 0° longitude . How Longitude is Measured Longitude is measured in degrees, minutes, and seconds: