"In an account sent to the Philosophical Transactions but for some reason never published there, or anywhere else, a young G. W. Leibniz, who throughout his life was an assiduous inquirer into miracles and other aberrations of nature, related the odd and troubling encounter he had with a certain astronomer who’d predicted that at noon on the last day of June 1666, the brightest time of day at nearly the brightest time of year, the Moon would pass very briefly, but very precisely, be-tween the Sun and the Earth, casting all of Europe for one instant in absolute darkness, “a darkness without equal in our history, but lasting no longer than four seconds,” the astronomer predicted, according to Leibniz, an eclipse that no other astronomer in Europe was predicting, and which, Leibniz explained, drew his notice in part because the astronomer in question, whose observations of the planets and the fixed stars were supposedly among the most accurate and the most precise ever made, superior to Tycho’s, was blind, and “not merely completely blind,” Leibniz wrote (in my translation from the Latin), “but in fact entirely without eyes.”"