What observation provided the key empirical confirmation for Einstein's General Theory of Relativity?

Answer

The bending of background starlight by the Sun during the 1919 solar eclipse

The key confirmation came in 1919 when Sir Arthur Eddington observed that the Sun's gravity caused the light from distant stars to bend exactly as predicted by Einstein's theory of space-time curvature.

What observation provided the key empirical confirmation for Einstein's General Theory of Relativity?

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