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18The custom, however, of referring the days to the seven stars called planets was instituted by the Egyptians, but is now found among all mankind, though its adoption has been comparatively recent; at any rate the ancient Greeks never understood it, so far as I am aware. 2But since it is now quite the fashion with mankind generally and even with the Romans themselves, and is to them already in a way an ancestral tradition, I wish to write briefly of it, telling how and in what way it has been so arranged. I have heard two explanations, which are not difficult of comprehension, it is true, though they involve certain theories. 3For if you apply the so -called “principle of the tetrachord” (which is believed to constitute the basis of music) to these stars, by which the whole universe of heaven is divided into regular intervals, in the order in which each of them revolves, and beginning at the outer orbit assigned to Saturn, 4then omitting the next two name the lord of the fourth, and after this passing over two others reach the seventh, and you then go back and repeat the process with the orbits and their presiding divinities in this same manner, assigning them to the several days, you will find all the days to be in a kind of musical connection with the arrangement of the heavens.
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