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Rh Father Grimaldi († 1663), professor of mathematics in the College at Bologna, gave an accurate description of the moon spots, discovered the diffraction of light, and, in his work Physico-Mathesis de Lumine, Coloribus et Iride, advanced the first attempt of a theory of undulation. This work was the basis of Newton's theory of light. Father Scheiner († 1650) was one of the first observers of the sun spots; it is disputed whether he or Galileo discovered them first. Scheiner also invented the pantograph, and, in his work Oculus, hoc est Fundamentum Opticum, laid down opinions of lasting value (especially on the accommodation of the eye).

More famous than these was Athanasius Kircher († 1680), a man of most extensive and varied learning who wrote on mathematics, physics, history, philology, and archaeology. He is the inventor of the magic lantern and other scientific instruments. He was the first who successfully studied the Coptic language and deciphered the Egyptian hieroglyphics. The very variety and universality of his learning was naturally a danger, to which he not unfrequently succumbed. He often betrays a lack of critical spirit,