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How a 1919 eclipse helped prove Einstein right

What if a total solar eclipse could settle a fight between Newton and Einstein? In 1919, British astronomers used one to test whether the Sun bends starlight, and the result changed physics forever.^[3]^[11]

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The setup was clever: compare stars near the eclipsed Sun with night-sky reference plates. Eddington went to Príncipe, Crommelin and Davidson to Sobral, while Dyson coordinated from England.^[3]^[4]

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Why the eclipse mattered: only totality made the Hyades stars visible beside the Sun. The predicted deflection was tiny, less than 2 arcseconds, so the measurements had to be incredibly precise.^[3]^[11]

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The weather did not make it easy. Príncipe saw storms and cloud cover, and Sobral’s main telescope gave blurred images, but the backup plates still supported Einstein’s prediction.^[4]^[12]^[23]

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On 6 November 1919, the results were announced in London, and newspapers called it a revolution in science. Einstein became world-famous, and the eclipse went down as one of science’s great turning points.^[3]^[23]^[24]

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Which part of the story surprised you most: the global expedition, the tiny angle they measured, or how fast Einstein became a celebrity? Reply with your pick.^[17]^[26]

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Curated by Joan [3]

royalsociety.org [4] royalobservatorygreenwich.org [11] esa.int [12]

sciencefriday.com [23]

theguardian.com [24]

biography.com [26]

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