As Zero Degrees shows, geographies of the prime meridian are a testament to the power of maps, the challenges of accurate measurement on a global scale, and the role of scientific authority in ...

An invisible line running through the Royal Observatory in Greenwich, England, marks the prime meridian. This line, extending from the North Pole to the South Pole, will be a guide to NPR's ...

That's a lot of standard candles. June 22 marks the 350th anniversary of the Royal Observatory Greenwich, the home of the historic Prime Meridian that is considered by many to be the birthplace of ...