What is Christmas?
The season of Christmas celebrates the Incarnation of Christ, when the Son of God became flesh, in the 12 days from Christmas Day to the Epiphany. The dates of this season, unlike Easter, are fixed. Christmas owes its origin to popular Gentile feasts that were supplanted by the Church. These feasts are based on the solar year, unlike Passover and Easter that depend on the lunar calendar.
The Christian year, therefore, parallels the actual history of the spread of Christianity, first in the preaching of the gospel to the Jews, then among the Gentiles. The seasons of the year are a reminder that the Christian faith has brought together all people, in which “there is no longer Jew and Greek, there is no longer male and female; for all of you are one in Christ Jesus.” (Galations 3:28)