Deinde ex novem partibus, quae sunt a planitia ad gnomonis centrum, viii sumantur et signentur in linea, quae est in planitia, ubi erit littera c.
Then of the nine parts which are between the centre of the gnomon and the point on the level line, let eight be taken and indicated by a point c.
final_alignments\Vitruvius_Architecture_Book_9.json