The basic element to the calendar is Sunday, which is a festival of Jesus’ resurrection.
However, Christian Churches have historically observed other festivals which commemorate events in the life of Jesus or of significant individuals in the history of the Church.
For the Ascension which, falling on fortieth day of Easter, will always be on a Thursday, the festival is sometimes transferred to the Seventh Sunday of Easter in addition to or in place of the normal part of the Easter festival for that day.
Commemorations are for individuals or events which have been noteworthy in the life of the Church and in the history of Lutheranism in particular.
These days do not take precedence over any other festival day, and if there is a conflict between a commemoration and a festival of any other rank, the commemoration is generally transferred to the next open weekday.
The principle of the Church of Sweden is that the Annunciation is celebrated on the Sunday between 21–27 March; although, should Good Friday or any other day of Holy Week, or Easter Sunday or Monday respectively, fall on 25 March, Annunciation is moved to the Sunday before Palm Sunday.
(For instance, in 2003 Annunciation was celebrated on 13 March; 2008 (when Easter Sunday was 23 March) it was celebrated on the 9th.) One unique feature of the ELCA calendar is that it has given congregations the options of two dates for the Transfiguration.
All Sundays, Seasons, and Festivals are related to these festivals.
Because Easter varies in date each year based on the vernal equinox and the phases of the moon, it is called a moveable feast (see: Computus).
Beyond their place in the Temporal or Sanctoral Cycles, the events commemorated on the Lutheran liturgical calendar fall into one of three different categories depending upon their liturgical priority: Festivals, Lesser Festivals, and Commemorations.
The Festivals are Nativity, Epiphany, the Baptism of our Lord, the Transfiguration, the Annunciation, Palm Sunday, Easter, the Ascension, Pentecost, Holy Trinity, All Saints, and Christ the King.
The Lutheran liturgical calendar is a listing which details the primary annual festivals and events that are celebrated liturgically by various Lutheran churches.
The calendars of the Evangelical Lutheran Church in America (ELCA) and the Evangelical Lutheran Church in Canada (ELCIC) are from the 1978 Lutheran Book of Worship and the calendar of Lutheran Church–Missouri Synod (LCMS) and the Lutheran Church - Canada use the Lutheran Book of Worship and the 1982 Lutheran Worship.
Dates affected by placement of Easter include Ash Wednesday and the start of Lent, the start of Easter itself, Pentecost, and Holy Trinity.