The Liturgical Year, Explained Simply

Ask when the year begins and most calendars answer January 1. The Church answers differently: its year begins on the First Sunday of Advent — November 29 in 2026 — and it unfolds not as twelve months but as a cycle of seasons that walk, in order, through the life of Christ. Once you see the shape of it, the colors at Mass, the shifting readings, and the sudden feasts stop looking random. Here is the whole year, explained simply.

The seasons in order

The liturgical year moves through a fixed sequence of seasons, and one of them comes around twice:

• Advent — about four weeks of waiting before Christmas; the year's beginning.
• Christmas — from December 25 through the Baptism of the Lord in January: the feast itself, then its unfolding in the Holy Family, Mary the Mother of God, and Epiphany.
• Ordinary Time, first stretch — the weeks after Christmas, following the public ministry of Jesus.
• Lent — forty days of preparation, from Ash Wednesday to Holy Week.
• The Sacred Triduum — the Church's three most solemn days: Holy Thursday, Good Friday, and the Easter Vigil.
• Easter — fifty days of celebration, from Easter Sunday to Pentecost.
• Ordinary Time, second stretch — the long green months of summer and fall, ending with the feast of Christ the King.

Then a new First Sunday of Advent arrives, and the cycle begins again.

What the colors mean

The quickest way to tell the season is the color of the vestments. Violet marks the preparatory seasons, Advent and Lent. White and gold belong to the great feasts — Christmas, Easter, and celebrations of Christ, Mary, and the saints who were not martyrs. Green is the color of Ordinary Time, the long seasons of growth. Red appears on days tied to the Passion and to the Holy Spirit — Palm Sunday, Good Friday, Pentecost — and on the feasts of martyrs. And twice a year, rose: on Gaudete Sunday in Advent and Laetare Sunday in Lent, when a season of restraint pauses to rejoice that the feast is near.

Why the Church keeps a calendar at all

It would be easy to mistake all this for decoration. It is closer to a rhythm — a way of letting time itself carry the story, so that the life of Christ is not something heard once but a cycle walked through annually. Advent practices waiting, Lent practices letting go, Easter practices celebrating longer than feels natural, and Ordinary Time covers the long middle distances. The repetition is the point: the same seasons return each year to a person who is not the same, and the same texts land differently at forty than they did at twenty. A calendar also means nobody has to invent their own pacing from scratch — the year makes the schedule, and the believer only has to show up for it.

Years A, B, and C

One more layer: the Sunday readings run on a three-year cycle. In Year A the Gospel passages come mainly from Matthew, in Year B from Mark, and in Year C from Luke, with John woven through the great seasons of every year. The cycle exists so that Sunday Mass, over three years, covers far more of the Gospels than a single-year rotation could. The year that begins on November 29, 2026 is Year B — the year of Mark, the shortest and fastest-moving of the four Gospels. Weekday Masses follow their own two-year cycle, so even daily Mass-goers rarely hear the same pairing two years running.