Google doodles London 2012 Javelin

Using a run-up the athlete must release the javelin before the end of the runway, launching it with one hand held over the shoulder. The distance the javelin travels is measured from the end of the runway to the point the javelin first touches the ground, which must be within the lines of the throwing sector. The javelin must land on its tip for the throw to be valid.

In all throwing events, athletes start with a qualifying round. Throwing in turn, each athlete gets three attempts to achieve a qualifying distance, decided by the International Association of Athletics Federations (IAAF) Technical Delegates. Once all throws have been completed, all athletes who have achieved the qualifying distance go through to the final. If fewer than 12 athletes achieve the qualifying standard, the best 12 athletes go through.

In the final, athletes have three initial throws, with the top eight after the first three rounds then having a further three throws. The athlete who performs the longest throw is the winner.

In the event of a tie, athletes' second-best throws are compared, followed by their third, and so on.

The Javelin throw events at London 2012 Olympics are scheduled from August 7 to August 11.

Google's daily Olympic doodle tradition began back in 2000 during the Sydney Olympics and continued through the 2002 Winter Olympics (Salt Lake City, USA), 2004 Athens Olympics, 2006 Torino Winter Olympics,

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