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#Mon Aug 09 12:03:52 CEST 2010
Slide__WTW4UKOdEd-WfYQ0GneCwQ_subTitle=In satellite navigation the measurement of distance is reduced to a measurement of time. The satellite signals spread at the velocity of light. A clock that goes wrong by a millisecond only per day leads the navigation therefore astray by almost 300 kilometres. <p></p> <p>The receiver does thus need an own atomic clock, or it uses the bearings of a fourth satellite in order to determine the own position within the four-dimensional 'spacetime'. This way, it synchronizes the internal clock to the on-board clock of the satellite.</p>
Slide__WTW4UKOdEd-WfYQ0GneCwQ_title=Error source\: time measurement<p></p>
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