Creator Spiritus

The Solemnity of Creator Spiritus, also known as the Solemnity of Creation or Fiat Sunday (Let-there-be Sunday) after the first words of the Introit (Fiat Lumen Dixit Altissimus, "Let there be Light said the Highest") marks the start of the Hosian Liturgical Year and the first Sunday of the Initium, the 4-week preparation for Spiritmass. Its readings commemorate the creation of the world and its fall into depravity, while the famous "the Spirit was in the Beginning", also known as the First Annunciation, from the Annunciation of Joseph is the Annunciation reading. Vestments are white or purple, according to which version of the Aurorian rite is celebrated.

Introit
Fiat Lumen Dixit Altissimus, deinde Facta Lumen