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Without the starting time it is Actually, knowing the starting time is still not enough.
During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.
You could talk about the tiny quartz crystal and the piezoelectric effect used to provide a stable time base for the electronic movement.
You can only establish the time for the race if it was timed by two or more qualified eyewitnesses who observed the start, the progress and the finish.But they do not even mention the basic problem that you cannot know the radioactive concentrations that existed in the rock in the past.In other words, the fatal problem with all radioactive dates is that they are all based on assumptions about the past.A swimming race illustrates the simple principles involved in measuring time.This swimmer is competing in a 1,500 metre race and we have an accurate, calibrated wristwatch.