Creation of the Universe
The Gaiad opens with the creation of the universe — the Big Bang, the formation of stars and galaxies, the birth of Earth, and the first stirrings of life. Days 1–28 span the deepest cosmic and geological time, from the first moments of existence through the Hadean and Archean eons.
Sagittarius has 28 days and covers days 1–28 of the Gaian year · Gaiad chapters 1–28.