Abstract
General relativity (GR) is based on the Universality of Free Fall, the Universality of the Gravitational Redshift, and Local Lorentz Invariance, alltogether called the Einstein Equivalence principle. This implies that gravity has to be described by a metrical theory. Such theories in general give rise to the standard effects like perihelion shift, light deflection, gravitational time delay, Lense-Thirring effect, and the Schiff effect. Only if the underlying theory is Einstein’s GR we have certain values for these effects. GR in turn predicts the existence, certain properties, and a particular dynamics of gravitational waves, black holes, binary systems, etc. which are also subject to experimental/observational proof. This includes practical applications in clock synchronization, positioning, navigation and geodesy.
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