Meridian Longitude <Windows>

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:

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 In 1884, the International Meridian Conference met in

When we talk about "meridian longitude," we are referring to the angular distance of a place east or west of a specific reference line known as the . The Prime Meridian: Point Zero meridian longitude