The <a href="https://en.wikipedia.org/wiki/Royal_Observatory,_Greenwich" id="mwuQ" rel="mw:WikiLink" title="Royal Observatory, Greenwich">Royal Greenwich Observatory</a> begins broadcasting the hourly time signals known as the <a href="https://en.wikipedia.org/wiki/Greenwich_Time_Signal" id="mwug" rel="mw:WikiLink" title="Greenwich Time Signal">Greenwich Time Signal</a>.