The 20th Century
Days 309–336 give a whole month to the 1900s — the world wars, the end of empires, and the turning points of the century. Scorpius is also the month of thanksgiving: Shichi-go-san on Scorpius 14, US Thanksgiving on Scorpius 18 or 25, and Niiname-sai on Scorpius 21.
Scorpius has 28 days and covers days 309–336 of the Gaian year · Gaiad chapters 309–336.