
The Three Gorges Dam holds back roughly 39 cubic kilometres of water on the Yangtze, and NASA calculated that shifting that much mass so far above sea level lengthened Earth's day by 0.06 microseconds by nudging the planet's moment of inertia
The Three Gorges Dam impounds roughly 39 cubic kilometres of Yangtze water at an average of 175 metres above sea level — enough mass, lifted high enough, to lengthen Earth's day by 0.06 microseconds by shifting the planet's moment of inertia.














