O eclipse de 1919 : a comprovacao da teoria da relatividade geral, a fisica moderna e o Observatorio Nacional = The eclipse of 1919 :the evidence of the theory of general relativity, modern physics and the National Observatory /Observatorio Navional.

"On May 29, 1919, a total eclipse of the Sun was recorded at Sobral, Ceara, and also at Principe Island, on the African coast. The experiments carried out in the observation of this ephemeris allowed the proof of the General Relativity Theory, which the physicist Albert Einstein had published in 1915. Brazil was a protagonist of this important achievement: the photographs recorded in Sobral confirmed the value predicted by the General Relativity Theory on light deflection. Three expeditions went to the city, organised by astronomer Henrique Morize, then director of the National Observatory. Starting the celebrations for the 100th anniversary of the total eclipse of the Sun, the National Observatory revisited the city that was the scene of this great science revolution, where it held the exhibition 'Through the sky of Sobral', with images recorded by the award-winning photographer Luiz Baltar, depicting the city and the radiant sky of the 'sertao', backlands. To close this commemorative year, the National Observatory launches this book, which brings together different views on the expeditions to Sobral and Principe Island and on the results that confirmed Einstein's Theory of General Relativity. These reports highlight the importance of the photographic plates taken at Sobral, which definitely provided the data that confirmed the predictions of Einstein's theory. May these articles allow the reader to travel back in time and especially to uncover the scientific revolution that these results have generated! Joao dos Anjos, Director of the National Observatory"--Provided by the publisher.