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opment of the Copernican system. Complete and final proof was adding in the succeeding years by Roemer's (1644-1710) discovery of the velocity of light, by Bradley's (1693-1762) study of its aberration,[1] by Bessel's discovery of stellar parallax in 1838,[2] and by Foucault's experimental demonstration of the earth's axial motion with a pendulum in 1851.[3]
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