Feast of the Circumcision of Christ of Jesus. Pope John XXIII's 1960 rubrical and calendrical revision called 1 January simply the Octave of the Nativity. (This 1960 calendar was incorporated into the 1962 Roman Missal, whose continued use is authorized by the motu proprio "Summorum Pontificum".) The 1969 revision states: "1 January, the Octave Day of the Nativity of the Lord, is the Solemnity of Mary, the Holy Mother of God, and also the commemoration of the conferral of the Most Holy Name of Jesus." The Anglican communion's "Book of Common Prayer" liturgy celebrates this day as the Circumcision of Christ. Since 2000, the "Common Worship"
Feast of the Annunciation as Christmas is to the winter solstice; because of this the Annunciation and Christmas were two of the four "quarter days" in medieval and early modern England, which marked the divisions of the fiscal year (the other two were Midsummer Day, or the Nativity of St. John the Baptist, on 24 June, and Michaelmas, the feast day of St. Michael, on 29 September). When the calendar system of Anno Domini was first introduced by Dionysius Exiguus in AD 525, he assigned the beginning of the new year to 25 March, because according to Christian doctrine, the age of grace began