Prime Meridian (IMAGE) University of Virginia Caption The Airy meridian is marked as the "Prime Meridian of the World" (dotted line), and the modern reference meridian indicating zero longitude using GPS (solid line). Credit (Imagery © 2014 Google Maps, Infoterra Ltd. & Bluesky) Usage Restrictions must note credit/copyright information License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.