100 Years Observation of Relativistic Light Deflection at the Sun

During a total solar eclipse on May 29, 1919, photogrammetric observations of stars close to the Sun were taken to confirm Einstein's General Theory of Relativity (GRT) by measuring the light deflection caused by the Sun. Today, similar observations are carried out with Very Long Baseline Interferometry (VLBI): Instead of the change in direction to a star, the differential difference in travel time from a quasar close to the Sun to radio telescopes on the Earth surface is measured with highest accuracy. Titov et al. (2018) report about a special VLBI experiment which was scheduled by the research division Higher Geodesy.

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 May 25, 2019

 Higher Geodesy