Cum autem ea vocata ad solis orbem superiora spectent, tunc inferiorem partem eius, quod candens non sit, propter aeris similitudinem obscuram videri.
But while those upper parts which are attracted look towards the suns sphere, the lower hemisphere of the moon, which does not shine, seems dark because of its resemblance to the air.
final_alignments\Vitruvius_Architecture_Book_9.json