In the Gaian calendar, every date permanently falls on the same day of the week. The year always begins on a Monday (Sagittarius 1). The week is one of the longest-lasting institutions in human culture, predating most states, surviving calendar reform, empire, and religion.
Each day is named for a celestial body first systematized in ancient Babylon. In the Gaian calendar, Friday, Saturday, and Sunday form the three Sabbaths, honoring the traditions of Islam, Judaism, and Christianity respectively while blending their meanings.