Introduction: one line to rule the world -- Geographical confusion -- Absurd vanity : the world's prime meridians before c.1790 -- Declarations of independence: prime meridians in America, c.1784-1884 ...

If you use your smartphone’s GPS to find Earth’s prime meridian – the north-south line marking zero degrees longitude – at Greenwich Observatory, you’ll notice something a bit odd. You won’t be ...

The historical prime meridian runs through a telescope established in 1851 by Sir George Airy at the Royal Observatory at Greenwich, England. It was adopted as an international standard as the prime ...

The prime meridian has shifted a few hundred feet. An astronomer helped figure out why. In 1884, a delegation of international representatives convened in Washington, D.C. to recommend that Earth's ...

A line marks the 'Prime Meridian of the World' at Longitude 0 degrees at the Royal Observatory in Greenwich on March 26, 2012, in London. Oli Scarff/Getty Images The 1884 International Meridian ...

Explains the concepts of latitude and longitude, which are used to locate places on Earth. It describes how latitude is measured in degrees north or south of the equator and how longitude is measured ...