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The Three Gorges Dam, the world's largest dam, affects Earth's rotation by slightly slowing it down due to water mass distribution. Located on the Yangtze River in China, it took 17 years to build and cost $37 billion. NASA's calculations indicate that when the dam's reservoir is full, the length of a day increases by about 0.06 microseconds. This phenomenon illustrates how human constructions can influence planetary physics. Other factors, like water reserves and ice loss, also impact Earth's rotation significantly. These minute changes are crucial for scientific research and satellite navigation.