PYANOPSION is the Ancient Greek lunar month of roughly October to November. The Greeks observed three major festivals during this time.
Pyanopsia honored Apollo and was held in Athens. The Greek hero Theseus began this ritual by first honoring Apollo for his assistance in helping him defeat the legendary Minotaur.
For more on the minotaur, check out this post: Many Shades of Minotaur- Grabbing Art By The Horns