In 2019 it will be celebrated all around the world the centennial anniversary of the solar eclipse observed on May 29th, 1919, which has constituted an extraordinary event for science. The measure of the starlight deflection by the Sun confirmed Einstein´s General Relativity Theory that deeply changed our conception of the Universe.  Decisive observations were done in Sobral (Ceará, Brazil), and also on Principe Island, by British astronomers. The results were publicly disclosed in London on November 6, 1919. After that day newspapers around the world reported headlines announcing a revolution in science: Einstein`s theory had supplanted Newton`s gravitational theory. That event made Einstein, a scientist formerly known only to his colleagues, the best-known scientist of all time. 

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In 1911 Einstein predicted that the light could be deflected when passing near a massive celestial body and proposed that this deflection could be measured in a total solar eclipse. In 1919, two British expeditions were organized: one, headed by Arthur Eddington, went to Príncipe Island; the other one, under Charles Davidson and Andrew Crommelin, went to Sobral. After months of careful analysis, Frank Dyson, Eddington and Davidson exposed the final results: the measures showed a good experimental agreement with that predicted by Einstein, 1.74 second of arc for the deflection angle of the light. According to Newton's theory the deflection should be half of that.