Throughout Eastertide—starting on Easter Sunday and ending on the Seventh Sunday after Easter, Pentecost Sunday—the Regina Caeli is the Marian antiphon for Night Prayer (Compline). After every Mass during this liturgical season at St. Vincent de Paul, the faithful will chant this prayer. It will replace the St. Michael Prayer that is typically recited at the end of each Mass. This is one of the four Marian antiphons the Church uses throughout the liturgical year.
The Alma Redemptoris Mater is chanted from the First Vespers of the First Sunday of Advent through the Feast of the Purification on February 2.
The Church has been singing the Ave, Regina Caelorum/Hail, O Queen of Heaven since the Purification until the Wednesday of Holy Week.
The Salve, Regina/Hail, Holy Queen is the antiphon during Ordinary Time, from Pentecost to the beginning of Advent.
This reflection from the University of Dayton website on the four Marian antiphons sums up the Regina Caeli and how richly it signifies the joys of Easter:
It is an Easter title of honor and signifies that the Mother of Christ already participates in the Easter glory of her son. Instead of the usual address for Mary, Ave, the Laetare, rejoice, is used. This is an invitation to look to Mary as she lives now: the servant of the Lord on earth has become queen of heaven. In her exaltation, she has become a sign for all who are united with Christ through baptism. . . . The antiphon reminds Mary, the crowned mother of the redeemer, of the promise fulfilled by using the angel's words, "He has risen as he said!" (Matthew 28,6) . . .
Learn More!
Read more about this ancient Marian hymn at the various links below: