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Special & General Relativity Made Easy
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Summary
Relativity is a method for two people to agree on what they see, if one of them is moving. The theory of relativity is used in everyday life, even though it is not called by that name. The GPS system, for example, depends on relativity. The GPS can pinpoint your location on earth, to within a few yards. It does this by using two dozen satellites 12,000 miles above the earth, and relativity.
The GPS receives a timer signal from three different satellites. Using Einstein’s theory of relativity, it calculates the distance from each satellite. Using triangulation, the GPS then records the user’s location.
Relativity was not a new concept with Einstein. Scientists had been trying to reconcile their observation of the world, if one was moving and the other not, for decades, before Einstein proposed this theory.
Part 2: http://www.youtube.com/watch?v=xNB7KEg9siM
Part 3: http://www.youtube.com/watch?v=z6pzEh6pE3A
Part 4: http://www.youtube.com/watch?v=KAaktsuFNQo
Keywords: Albert Einstein, Cassiopeia Project, GPS, special theory of relativity, general theory of relativity
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