Geodetic effect
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The geodetic effect represents the effect of the curvature of space-time, predicted by general relativity on a spinning, moving body. A related effect was first predicted by Willem de Sitter in 1916 , who provided relativistic corrections to the Earth-Moon system's motion. It will be measured with unprecedented precision by Gravity Probe B, an experiment which measures the tilting of the spin axis of gyroscopes in orbit about the Earth.