The planet Geb completes a revolution around Ra, an orange dwarf star, every 336 days. The year is divided into 12 moons, each with four seven-day weeks, totaling 28 days per moon. Each moon begins on the day of the new moon (see Moons for phases). The moons are grouped into four seasons. The larger moon is Jagua. The smaller moon is Kaguya. They always remain side-by-side in orbit. Due to their proximity, they keep the same phase.
To determine a character's birthday, roll d12 for the Moon and d28 for the day.
| Season | Moon | Numeral | Festival Days |
|---|---|---|---|
| Spring | Dead Moon | 1 | Louz (12), Aneara (20) |
| Spring | Blade Moon | 2 | Riswa (6) |
| Spring | Seed Moon | 3 | Rook (20) |
| Summer | Rose Moon | 4 | Grack (16) |
| Summer | Reed Moon | 5 | Cine (2), Zo (18) |
| Summer | Blood Moon | 6 | Foresi (11), Sleal (23) |
| Autumn | Harvest Moon | 7 | Scaepa (1) |
| Autumn | Pilgrim Moon | 8 | Tenn (19) |
| Autumn | Frost Moon | 9 | Mote (9), Tralf (11), Bel (28) |
| Winter | Long Moon | 10 | Nefer (15) |
| Winter | Old Moon | 11 | Venha (20) |
| Winter | Storm Moon | 12 | Geos (28) |
During the Winter in temperate regions, all infection checks are at -1%.