Seasons of the year
The foundation of the Christian year is the regular celebration of Jesus' resurrection by the earliest Christian every Sunday, the 'first day of the week', this was also known as 'the Lord's Day'. Key times that were also marked in the early Christian calendar were Easter, Pentecost and Epiphany.

The Seasons of the Church's year run from the First Sunday of Advent, through to the Festival of Christ the King, which rounds off the year; including and in between these the calendar is as follows:

Advent
Christmas
Christmas Day
Epiphany
The Baptism of Christ
The Presentation of Christ in the Temple
Sundays before Lent
Lent
Ash Wednesday
Maundy Thursday
Good Friday
Eastertide
Ascension
Pentecost
Ordinary Time
Trinity Sunday
All Saints' Day
Sundays before Advent
Christ the King