The pyanepsion is the fourth month of the Greek Calendrier antique in force in the area of Athens, it lasted 29 days lain roughly between on September 22nd and on November 20th of our calendar actuel.
Il car its name of the Greek word ( Πυανεψιών / Puanépsiốn ) of the dependant festival of the Pyanepsies as a l honnor d´ Apollo.

Pendant its course was held in particular:

• the Thesmophories (the 11-13)