The <a href="https://en.wikipedia.org/wiki/International_Meridian_Conference" id="mwjw" rel="mw:WikiLink" title="International Meridian Conference">International Meridian Conference</a> designates the <a href="https://en.wikipedia.org/wiki/Royal_Observatory,_Greenwich" id="mwkA" rel="mw:WikiLink" title="Royal Observatory, Greenwich">Royal Observatory, Greenwich</a> as the world's prime meridian.