Umbrarum enim aequinoctialium magnitudinibus designantur analemmatorum formae, e quibus perficiuntur ad rationem locorum et umbrae gnomonum horarum descriptiones.
For the length of the shadows at the equinox determines the design of the analemma by which the hours are marked in accordance with the locality and the shadow of the gnomon.
final_alignments\Vitruvius_Architecture_Book_9.json