"The orbit of the earth is a circle; round the spheres to which this circle belongs describe a dodecahedron; the spheres including this will give the orbit of Mars. Round Mars describe a tetrahedron; the circle including this will be orbit of Jupiter. Describe a cube round Jupiter’s orbit; the circle including this will be Saturn. Now, inscribe in the earth’s orbit an icosahedron, the circle inscribed in it will be the orbit of Venus: inscribe an octahedron in the orbit of Venus: the circle inscribed in it will be Mercury’s orbit. This is the reason of number of planets."
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Kepler in his first published work Mysterium Cosmographicum (1597) quoted in: Concepts in Physical Science, Education Resources Information Center (eric.ed.gov), p. 11
https://en.wikiquote.org/wiki/Mercury_(planet)
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Mercury (planet)
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