Every year, thousands of people come to the Royal Observatory Greenwich to have their photograph taken on the Prime Meridian Line - Longitude 0 Degrees - as they stand in the Eastern and Western Hemispheres at the same time. But what is the purpose and history of the Greenwich Meridian?
Every year, thousands of people come to the Royal Observatory Greenwich to have their photograph taken on the Prime Meridian Line - Longitude 0 Degree...
