A holy day of obligation, on the octave day of Christmas. The Solemnity of Mary, the Holy Mother of God is a feast day of the Blessed Virgin Mary under the aspect of her motherhood of Jesus Christ, whom she had circumcised on the eighth day after his birth in accordance with Levitical Law. Christians see him as the Lord and Son of God. It is celebrated by the Roman Rite of the Catholic Church on 1 January, the Octave (8th) day of Christmastide. This solemnity is a Holy Day of Obligation in areas that have not abrogated it. Given that the Solemnity of Mary, Mother of God falls on New Year's Day, the Watchnight Mass remains a popular tradition that starts in the late hours of the previous day and continues into the early morning. The Eastern Orthodox Church,, along with Christians of Byzantine, West Syriac, and East Syriac Rites celebrate Mary as the Mother of God on 26 December (also known as the Synaxis of the Theotokos), while the Coptic Church (an Oriental Orthodox church) does so on 16 January. Traditional Catholics, the Lutheran Church and the Anglican Communion, observe the Feast of the Circumcision of Christ on 1 January. In the Traditional Catholic calendar and Western Rite Vicariate of the Antiochian Orthodox Church is a feast of the Motherhood of the Blessed Virgin Mary on 11 October. Wiki link Dates computed from the General Roman Calendar. Text: Wikipedia (CC BY-SA).