III. When is the Liturgy Celebrated?

From The Catechism of the Catholic Church

1163
“Holy Mother Church believes that she should celebrate the saving work of
her divine Spouse in a sacred commemoration on certain days throughout the
course of the year. Once each week, on the day which she has called the Lord’s
Day, she keeps the memory of the Lord’s resurrection. She also celebrates it
once every year, together with his blessed Passion, at Easter, that most solemn
of all feasts. In the course of the year, moreover, she unfolds the whole
mystery of Christ …. Thus recalling the mysteries of the redemption, she
opens up to the faithful the riches of her Lord’s powers and merits, so that
these are in some way made present in every age; the faithful lay hold of them
and are filled with saving grace.”³³

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION ONE THE SACRAMENTAL ECONOMY
- CHAPTER TWO THE SACRAMENTAL CELEBRATION OF THE PASCHAL MYSTERY
  - Article 1 CELEBRATING THE CHURCH’S LITURGY
    - III. When is the Liturgy Celebrated?

From The Catechism of the Catholic Church – rosary.team