Timaeus

Plato · en
And so the thought of God made a God in the image of a perfect
      body, having intercourse with himself and needing no other, but
      in every part harmonious and self-contained and truly blessed.
      The soul was first made by him—the elder to rule the younger; not
      in the order in which our wayward fancy has led us to describe
      them, but the soul first and afterwards the body. God took of the
      unchangeable and indivisible and also of the divisible and
      corporeal, and out of the two he made a third nature, essence,
      which was in a mean between them, and partook of the same and the
      other, the intractable nature of the other being compressed into
      the same. Having made a compound of all the three, he proceeded
      to divide the entire mass into portions related to one another in
      the ratios of 1, 2, 3, 4, 9, 8, 27, and proceeded to fill up the
      double and triple intervals thus—

  - over 1, 4/3, 3/2, - over 2, 8/3, 3, - over 4, 16/3, 6,  - over 8:
  - over 1, 3/2, 2,   - over 3, 9/2, 6, - over 9, 27/2, 18, - over 27;

      in which double series of numbers are two kinds of means; the one
      exceeds and is exceeded by equal parts of the extremes, e.g. 1,
      4/3, 2; the other kind of mean is one which is equidistant from
      the extremes—2, 4, 6. In this manner there were formed intervals
      of thirds, 3:2, of fourths, 4:3, and of ninths, 9:8. And next he
      filled up the intervals of a fourth with ninths, leaving a
      remnant which is in the ratio of 256:243. The entire compound was
      divided by him lengthways into two parts, which he united at the
      centre like the letter X, and bent into an inner and outer circle
      or sphere, cutting one another again at a point over against the
      point at which they cross. The outer circle or sphere was named
      the sphere of the same—the inner, the sphere of the other or
      diverse; and the one revolved horizontally to the right, the
      other diagonally to the left. To the sphere of the same which was
      undivided he gave dominion, but the sphere of the other or
      diverse was distributed into seven unequal orbits, having
      intervals in ratios of twos and threes, three of either sort, and
      he bade the orbits move in opposite directions to one
      another—three of them, the Sun, Mercury, Venus, with equal
      swiftness, and the remaining four—the Moon, Saturn, Mars,
      Jupiter, with unequal swiftness to the three and to one another,
      but all in due proportion.