found using the general theory of relativity. Shapiro, S. S.; Davis, J. L.;Lebach, D. E.; Gregory J.S. Measurement of the solar gravitational deflection of
1103/PhysRevLett.78.2054, arXiv:astro-ph/9609169 Shapiro, S. S.; Davis, J. L.; Lebach, D. E.; Gregory, J. S., Measurement of the solar gravitational deflection