Chapter I: The Liturgical Year
1. Christ's saving work is celebrated in sacred memory by the Church on fixed days throughout the year.
Each week on the day called the Lord's Day the Church commemorates the Lord's resurrection.
Once a year at Easter the Church honors this resurrection and passion with the utmost solemnity.
In fact through the yearly cycle the Church unfolds the entire mystery of Christ and keeps the
anniversaries of the saints.
During the different seasons of the liturgical year, the Church, in accord with traditional
discipline, carries out the formation of the faithful by means of devotional practices, both interior
and exterior, instruction, and works of penance and mercy. 
2. The principles given here may and must be applied to both the Roman Rite and all others;
but the practical rules are to be taken as pertaining solely to the Roman Rite, except in matters
that of their nature also affect the other rites.