Second Vatican Council
The Second Ecumenical Council of the Vatican, commonly known as the or , addressed relations between the Catholic Church and the modern world. The council, through the Holy See, was formally opened under the pontificate of Pope John XXIII on 11 October 1962 and was closed under Pope Paul VI on the Solemnity of the Immaculate Conception on 8 December 1965.
Calcata
In reality, it was more than two years before 11 October 1962, the date when the Second Vatican Council began, that a 25 July 1960 decree of Pope John XXIII enacted a wide-ranging revision of the General Roman Calendar, which included changing the name of the 1 January feast from "Circumcision of the Lord and Octave of the Nativity" to "Octave of the Nativity", with no change of the Gospel reading about the circumcision of the child Jesus.