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The Italian astronomer Giovanni Battista Riccioli is commonly credited withperforming the first precise experiments to determine the acceleration of afreely falling body. Riccioli has been discussed by historians of science,sometimes positively but often not, but translations of his work into modernlanguages are not readily available. Presented here is a translation of hisexperiments regarding the nature of the motion of a falling body. Riccioliprovides a thorough description of his experiments, and his data are quitegood. He appears to have a model approach to science: He attacks the questionof free fall with the expectation of disproving Galileo's ideas, yet he isconvinced by his data that Galileo is indeed correct, and he promptly informs aformer prot\'eg\'ee of Galileo's of the results.

Doubting, Testing, and Confirming Galileo: A translation of Giovanni  Battista Riccioli's experiments regarding the motion of a falling body, as  reported in his 1651 Almagestum Novum