Yesterday marked 500 days to go until the opening ceremony.
The launch event opened to the public at 7pm and lasted around 45 minutes, with Locog chair Seb Coe, Mayor of London Boris Johnson, Omega ambassador and world champion heptathlete Jessica Ennis, and president of Omega Stephen Urquhart all in attendance. It was broadcast live on several television channels.
The clock itself was revealed by four Olympic gold medallists from Team GB – rowers Pete Reed and Andy Hodge, and sailors Iain Percy and Andrew Simpson.
"The countdown begins right now in the very heart of the capital as we gear up to stage the best Games in living memory, and the excitement spreads outwards from Trafalgar Square to every corner of our great city," said Johnson.
"In 500 days time the atmosphere will be electric as the Olympic cauldron bursts into flames, signalling the beginning of the world's greatest sporting event, and London 2012's glorious legacy unfolds," he added.
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