Namque sol aequinoctiali tempore ariete libraque versando, quas e gnomone partes habent novem, eas umbrae facit viii in declinatione caeli, quae est Romae.
For the sun, in his revolution, at the time of the spring and autumn equinoxes, casts a shadow, in the latitude of Rome, which is equal to eight-ninths of the height of the gnomon.
final_alignments\Vitruvius_Architecture_Book_9.json