Et ab ea regione ad extremam circinationem curvaturae parallelos linea designatur, in qua constituitur frons scaenae, per centrumque orchestrae proscaenii regione parallelos linea describitur, et qua secat circinationis lineas dextra ac sinistra, in cornibus hemicycli centra signantur.
On the same side, parallel to this a line is drawn to touch the outside of the circle, and on this the front of the scenery is marked out. Through the centre of the orchestra a line is described parallel to the proscenium; where it cuts the circumference right and left, centres are marked at the ends of the semi-circle.
final_alignments\Vitruvius_Architecture_Book_5.json