IDIA Lab was contracted by digital humanities scholars at UCLA to design and build a virtual simulation of the Temple of Artemis, one of the Wonders of the Ancient World, This massive Greek temple, four times the size of the Parthenon lies in ruin in present-day Turkey. This simulation incorporates our CelestialEngine with accurately positions both the sun and moon using a site’s latitude, longitude, altitude and year via NASA JPL data. This particular simulation studies whether an opening in the temple’s portico allowed moonlight to illuminate the statue of Artemis on her feast day.