In the Ordinary Form, this is the Baptism of the Lord.
Saints & Celebrations:
Today, January 9, there is no special fixed liturgical day in the Ordinary Form.
There is no special fixed liturgical day in the Extraordinary Form.
For information about other saints, blesseds, and feasts celebrated today, you can click here.
To see today's readings in the Ordinary Form, you can click here.
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According to the Holy See's Directory on Popular Piety:
The Feast of the Baptism of the Lord
119. Closely connected with the salvific events of the Epiphany are the mysteries of the Baptism of the Lord and the manifestation of his glory at the marriage feast of Cana.
Christmastide closes with the Baptism of the Lord. Only in recent times has the feast been rehabilitated, and hence has not given rise to any particular displays of popular piety. However, the feast presents an excellent opportunity for the faithful to be reminded of their rebirth as children of God in Baptism. The rite of asperges could be opportunely used at all Masses on this day, and homilies could well concentrate on the symbols associated with Baptism.