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11All those which make their circuit above that of the sun, especially when they are in trine aspect, do not advance, but, on the contrary, are retrograde, and seem to stop till the sun passes from the trinal sign into another. Some are of opinion, that this happens on account of their great distance from the sun, on which account their paths not being sufficiently lighted, they are retarded by the darkness. But I am not of that opinion, since the brightness of the sun is perceptible, evident and unobscured throughout the system, just as it appears to us, as well when the planets are retrograde as when they are stationary. If, then, our vision extends to such a distance, how can we imagine it possible to obscure the glorious splendour of the planets?
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