The Ten Books on Architecture, 9.6.1

Vitruvius  translated by Morris Hicky Morgan

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Astrology and Weather Prognostics

6I have shown how the firmament, and the twelve signs with the constellations arranged to the north and south of them, fly round the earth, so that the matter may be clearly understood. For it is from this revolution of the firmament, from the course of the sun through the signs in the opposite direction, and from the shadows cast by equinoctial gnomons, that we find the figure of the analemma.

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