legendary, attestations to the veneration of the martyr date from ancient times. His change in the calendar of saints included "leaving the memorial of Saint Christopher to local calendars", because of the relatively late date of its insertion into the Roman calendar. Liturgical year In the liturgical books, the document General Roman Calendar, which lists not only fixed celebrations but also some moveable ones, is printed immediately after the document Universal Norms on the Liturgical Year and the Calendar, which states that "throughout the course of the year the Church unfolds the entire mystery of Christ and observes the birthdays of the Saints". The birth of a saint to heaven is as a rule celebrated on a fixed day of the year. Sometimes they may be moved either to or from a Sunday. The mysteries of Christ are often celebrated on dates that always vary from year to year. The Catholic Church's year combines two cycles of liturgical celebrations. One has been called the Proper of Time or Temporale, associated with the moveable date of Easter and the fixed date of Christmas. The other is associated with fixed calendar dates and has been called the Proper of Saints or Sanctorale. The General Roman Calendar includes celebrations that belong to the Proper of Time or Temporale and is not limited to those that make up the Proper of Saints or Sanctorale. An instance where two observances occur on the same date is called an occurrence. Transfer of celebrations Some celebrations listed in the General Roman Calendar are transferred to another date: List of celebrations inscribed in the GRC This list contains all celebrations currently inscribed in the General Roman Calendar. It is updated whenever the pope makes changes to the celebrations in the General Roman Calendar. When no citation is provided for a particular celebration, it comes from Calendarium Romanum Generale (General Roman Calendar) as printed in the Latin original of Roman Missal, ed. typ. tertia (reimpressio emendata), released in 2008. Celebrations that are added or changed are cited from official decrees. Celebration names are used from English Roman Missal (2018). January 1 January: Solemnity of Mary, the Holy Mother of God – solemnity 2 January: Saints Basil the Great and Gregory Nazianzen, Bishops and Doctors of the Church – memorial 3 January: The Most Holy Name of Jesus – optional memorial 6 January: The Epiphany of the Lord – solemnity