Itaque, Caesar, his auctoribus fretus sensibus eorum adhibitis et consiliis ea volumina conscripsi, et prioribus septem de aedificiis, octavo de aquis, in hoc de gnomonicis rationibus, quemadmodum de radiis solis in mundo sunt per umbras gnomonis inventae quibusque rationibus dilatentur aut contrahantur, explicabo.
Therefore, your Highness, I have relied on these authors, and bringing their minds and advice to bear, I have composed these volumes, dealing with buildings in the first seven, and with water in the eighth. In the present volume I will expound the methods of Dialling; how they were discovered from the rays of the sun in the universe, by the shadows of the gnomon, and in what proportions these lengthen or diminish.
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