Itaque quemadmodum sol per siderum spatia vadens dilatat contrahitque dies et horas, sic bulla in horologiis ingrediens per puncta contra centri tympani versationem, cotidie cum transfertur aliis temporibus per latiora, aliis per angustiora spatia, menstruis finitionibus imaginis efficit horarum et dierum.
Therefore just as the sun traversing the spaces of the constellations lengthens and contracts the days and hours, so the index moving along the holes in the dial in the opposite direction to the revolving drum, passes daily sometimes over longer, sometimes over shorter spaces; thus it produces over the monthly periods the representation of the hours and days. .
final_alignments\Vitruvius_Architecture_Book_9.json