Tests of general relativity serve to establish observational evidence for the theory of general relativity. In the 1970s, additional tests began to be made, starting with Irwin Shapiro’s measurement of the relativistic annalen der Physik, 1907, Vol. 327 (Classic Reprint) PDF delay in radar signal travel time near the sun.

Författare: Wilhelm Wien.

In February 2016, the Advanced LIGO team announced that they had directly detected gravitational waves from a black hole merger. In the letter to the London Times on November 28, 1919, he described the theory of relativity and thanked his English colleagues for their understanding and testing of his work. The chief attraction of the theory lies in its logical completeness. Under Newtonian physics, a two-body system consisting of a lone object orbiting a spherical mass would trace out an ellipse with the spherical mass at a focus. Mercury deviates from the precession predicted from these Newtonian effects. This anomalous rate of precession of the perihelion of Mercury’s orbit was first recognized in 1859 as a problem in celestial mechanics, by Urbain Le Verrier. In general relativity, this remaining precession, or change of orientation of the orbital ellipse within its orbital plane, is explained by gravitation being mediated by the curvature of spacetime.

Einstein showed that general relativity agrees closely with the observed amount of perihelion shift. Although earlier measurements of planetary orbits were made using conventional telescopes, more accurate measurements are now made with radar. The total observed precession of Mercury is 574. Thus the effect can be fully explained by general relativity. More recent calculations based on more precise measurements have not materially changed the situation.