Vitruvius Pollio, The Ten Books on Architecture, BOOK IX, CHAPTER VII: THE ANALEMMA AND ITS APPLICATIONS, section 3

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3. Then, of the nine parts between the plane and the centre on the gnomon, take eight, and mark them off on the line in the plane to the point C. This will be the equinoctial shadow of the gnomon. From that point, marked by C, let a line be drawn through the centre at the point A, and this will represent a ray of the sun at the equinox. Then, extending the compasses from the centre to the line in the plane, mark off the equidistant points E on the left and I on the right, on the two sides of the circumference,

and let a line be drawn through the centre, dividing the circle into two equal semicircles. This line is called by mathematicians the horizon.

Vitruvius: The Ten Books on Architecture. Vitruvius. Morris Hicky Morgan. Cambridge: Harvard University Press. London: Humphrey Milford. Oxford University Press. 1914.

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Vitruvius Pollio, The Ten Books on Architecture
Morris Hicky Morgan, Ed.

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Vitruvius Pollio, The Ten Books on Architecture Morris Hicky Morgan, Ed.

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Vitruvius Pollio, The Ten Books on Architecture
Morris Hicky Morgan, Ed.