III. When is the Liturgy Celebrated?

From The Catechism of the Catholic Church

1177
The hymns and litanies of the Liturgy of the Hours integrate the prayer of the
psalms into the age of the Church, expressing the symbolism of the time of day,
the liturgical season, or the feast being celebrated. Moreover, the reading
from the Word of God at each Hour (with the subsequent responses or troparia)
and readings from the Fathers and spiritual masters at certain Hours, reveal
more deeply the meaning of the mystery being celebrated, assist in
understanding the psalms, and prepare for silent prayer. the lectio divina,
where the Word of God is so read and meditated that it becomes prayer, is thus
rooted in the liturgical celebration.

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