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The Enlightenment began then, from the belief in a rational, orderly and comprehensible universe—then proceeded, in stages, to form a rational and orderly organization of knowledge and the state, such as what is found in the idea of Deism.
The Enlightenment was a time when the solar system was truly "discovered": with the accurate calculation of orbits, such as Halley's comet, the discovery of the first planet since antiquity, Uranus by William Herschel, and the calculation of the mass of the Sun using Newton's theory of universal gravitation.
Alternatively, the Enlightenment was used as a powerful symbol to argue for the supremacy of rationalism and rationalization, and therefore any attack on it is connected to despotism and madness, for example in the writings of Gertrude Himmelfarb and Robert Nozick.