This traditional translation of the Proclamation of the Birth of Christ comes from the Roman Martyrology, the official listing of the saints celebrated by the Roman Rite of the Catholic Church.
For centuries, it was read on Christmas Eve, before the celebration of Midnight Mass.
Saint John Paul II, as pope, decided once again to include the Proclamation of the Birth of Christ in the papal celebration of Midnight Mass. Since the papal Midnight Mass at St Peter’s Basilica is broadcast worldwide, interest in the Proclamation revived and many parishes began to include it in their celebrations as well.
The Proclamation of the Birth of Christ situates the Nativity of Christ within the context of human history generally and salvation history specifically, making reference not only to biblical events (the Creation, the Flood, the birth of Abraham, the Exodus) but also to the Greek and Roman worlds (the original Olympics, the founding of Rome). The coming of Christ at Christmas, then, is seen as the summit of both sacred and secular history.
The Twenty fifth Day of December,
when ages beyond number had run their course
from the creation of the world,
when God in the beginning created heaven and earth
and formed man in his own likeness,
when century upon century had passed
since the Almighty set His bow in the clouds after the Great Flood,
as a sign of covenant and peace,
in the twenty-first century since Abraham, our father in faith,
came out of Ur of the Chaldees;
in the thirteenth century since the People of Israel were led by Moses
in the Exodus from Egypt,
around the thousandth year since David was anointed King,
in the sixty fifth week of the prophecy of Daniel,
in the one hundred and ninety-fourth Olympiad,
in the year seven hundred and fifty two
since the foundation of the City of Rome,
in the forty second year of the reign of Caesar Octavian Augustus,
the whole world being at peace,
Jesus Christ, eternal God and Son of the eternal Father,
desiring to consecrate the world by His most loving presence,
was conceived by the Holy Spirit,
and when nine months had passed since His conception,
was born of the Virgin Mary in Bethlehem of Judah,
and was made man –
The Nativity of Our Lord Jesus Christ according to the flesh.