Your liturgical trivia for today: in "Cum Nostra Hac Aetate" (1955), Pope Pius XII changed the name of the Octave day of Epiphany (13 Jan) to the Commemoration of the Baptism of the Lord. (He also abolished the Octave of the Epiphany.)
All the liturgical texts of the Mass and Office were kept the same as they had been on the Octave day of the Epiphany. The newly-named Commemoration of the Baptism of the Lord was given the rank of Duplex Maius (major double).
In 1960, Pope John XXIII abolished doubles and so the Commemoration of the Baptism of the Lord became a second class feast.
In 1969, "Calendarium Romanum" placed the feast on the Sunday after the Epiphany with the rank of "Feast". It was now called simply "The Baptism of the Lord".
In the calendar from 1970, if the Epiphany is transferred to Sunday and if the Sunday falls on 7 or 8 January, the Feast of the Baptism of the Lord is celebrated on the following Monday.
Those changes happened in the space of fourteen years. (Imagine the process happening between 2006 and now.)
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