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 ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Tourists who want to take photographs at the prime meridian often stand at the Royal Observatory ...

Receive emails about upcoming NOVA programs and related content, as well as featured reporting about current events through a science lens. The Prime Meridian was set in 1884 using the large Transit ...

Scientists have explained why the Greenwich Meridian appears to have drifted substantially east (or to the right, if you stand in the park and face north). Now the big question is: should the marker, ...