With this antiphon, the Church proclaims Easter Sunday the greatest day of the year. For the Christian believer every day is, of course, a celebration of Jesus Christ's resurrection from the dead, as is every Mass. Yet daily rejoicing pales in comparison to that of the Sunday Mass, since Sunday is the day that the resurrection took place, the "eighth" day of the week signifying a new creation and a new life. And these Sundays of the year, in turn, are dwarfed by Easter, the Feast of Feasts celebrated in the newness of the vernal moon and in the rebirth of springtime.

Easter is the Christian day par excellence.

The commemoration of our Lord's physical resurrection from the dead provides not only the crucial resolution to the Passion story, but to several liturgical themes stretching back over the past two months.

Easter ends the seventy days of Babylonian exile begun on Septuagesima Sunday by restoring the Temple that was destroyed on Good Friday, i.e. the body of Jesus Christ.

It ends the forty days of wandering in the desert begun on Ash Wednesday by giving us the Promised Land of eternal life.

It ends the fourteen days of concealment and confusion during Passiontide by revealing the divinity of Jesus Christ and the meaning of His cryptic prophecies.

It ends the seven days of Holy Week by converting our sorrow over the crucifixion into our jubilance about the resurrection.

And it ends the three days of awesome mystery explored during the sacred Triduum by celebrating the central mystery of our faith: life born from death, ultimate good from unspeakable evil. It is for this reason that all the things that had been instituted at one point or another during the past penitential seasons (the purple vestments or the veiled images) are dramatically removed, while all the things that had been successively suppressed (the Alleluia, the Gloria in excelsis, several Gloria Patri's, or the bells) are dramatically restored.

The Easter season (or Paschaltide, as it is traditionally known) is not an undifferentiated block of joy but one that consists of several distinct stages. The first is the Easter Octave, lasting from Easter Sunday to "Low" Sunday. These eight days comprise a prolonged rejoicing in our Savior's victory over death and in the eternal life given to the newly baptized converts. In fact, Christian initiates used to receive a white robe upon their baptism on Holy Saturday night and would wear it for the rest of the week. They would take off these symbols of their new life on the following Sunday, which in Latin is called Dominica in albis depositis as a result of this practice. (The English name, Low Sunday, was used as a contrast to the high mark of Easter). For centuries the first Sunday after Easter was also the day when children would receive their first Holy Communion, often with their father and mother kneeling beside them. So meaningful was this event that in Europe it was referred to as the "most beautiful day of life." (Significantly, both customs are encapsulated in Low Sunday's stational church, the basilica of St. Pancras: St. Pancras, a twelve-year-old martyr, is the patron saint of children and neophytes). Finally, in addition to the two Sundays of the Easter Octave, several of the weekdays within the Octave assumed a special importance.

The close of the Easter Octave, however, does not end the jubilance of Paschaltide. The Allelulia continues to be used copiously in the Mass and in the divine office; the Vidi Aquam and Regina coeli continue to replace the Asperges and Angelus; and the Paschal candle still burns bright. Nevertheless, a discernible shift in mood and meaning takes place. The weekdays no longer have their own set of Mass propers, while the Sunday propers tend to focus less on the specific events of the Resurrection and more on the general legacy of Christ's victory. There also occurs an interesting "triduum" immediately prior to the Feast of the Ascension known as the Lesser Rogation Days. Instituted in the 400s by St. Claudianus Mamertus in response to a series of natural catastrophes that were plaguing the diocese of Vienne in Dauphiny, the observance soon spread to the rest of France in the sixth century and then to Rome in the ninth. Rogationtide consists of penitential processions from or to the church during which are prayed poignant litanies petitioning for deliverance from a multitude of evils. Because these rogations were often agricultural, processions would often be conducted into the field for the priest to bless the crops. The Lesser Rogation Days were also once considered an ideal time to mend any personal rifts between parishioners.

This phase of Paschaltide also marks an anticipation of and preparation for the next cardinal event that the Church celebrates: the Ascension of our Lord into heaven forty days after His resurrection. In a sense this feast ends the Easter revelry: after the Gospel is read during the Ascension Thursday Mass, the Paschal candle is extinguished.

These texts on the liturgical year are reproduced from the: Holy Trinity Latin Mass Website.