Chovat Halevavot, the classical work on Jewish ethics, was authored by Rabbi Bachya ben Yosef ibn Paquda (the first "Rabbeinu Bechayei") on or before 1161, and translated into Hebrew from the original Arabic by the famed translator R. Judah ibn Tibbon in 1167. It was first published on the 25th of Tevet of the year 5319 from creation (1559).
This Shabbat is Shabbat Mevarchim ("the Shabbat that blesses" the new month): a special prayer is recited blessing the Rosh Chodesh ("Head of the Month") of upcoming month of Shevat, which falls on Thursday of next week.
Prior to the blessing, we announce the precise time of the molad, the "birth" of the new moon.
Click here for molad times.
It is a Chabad custom to recite the entire book of Psalms before morning prayers, and to conduct farbrengens (chassidic gatherings) in the course of the Shabbat.