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, each with its own meaning: Friday, the Alpha (Aster), is the day of gathering and unification; Saturday, the Lambda (Leona), is the day of rest, growth and discipline; Sunday, the Omega (Andromeda), is the day of aspiration and the future. Monday to Thursday are the ordinary days, and their names are restored to the planets wherever a language only counts them; the Sabbath names are kept.