Subtle is the Lord by Abraham Pais (1982) page 22 mentions that when Einstein saw this in 1915, he was so excited he couldn't work for three days.
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Tests of general relativity refer to experiments and observations that are designed to confirm or challenge the predictions made by Einstein's theory of general relativity (GR). General relativity, proposed in 1915, is a theory of gravitation that describes gravity as the curvature of spacetime caused by mass and energy. Over the years, many tests have been conducted to validate its predictions in various contexts.