CATHEDRAL CHURCH OF ST. PAUL
The service of Vespers or Evening Prayer is part of the Church's Liturgy of the Hours. As the evening approaches and the day is about to end, we, the Church, pause to remember the blessings that the Lord has bestowed on each of us during the day and pray for our redemption. It is a time when we raise our hands as praise and sacrifice. We affirm our faith in the light that knows no setting. We offered Vespers together at the Cathedral on March 20 as the sun was setting on the first day of Spring.
Before we did, many of us joined together in the Cenacle to share a simple meal of soup and bread as sisters and brothers in Christ. To read more about the Liturgy of the Hours, Google Books has portions of the USCB's Liturgy of the Hours available at this site. There are many other places online where you can find information about the daily prayers of the Church but the Catechism of the Catholic Church explains it this way: 
The mystery of Christ, his Incarnation and Passover, which we celebrate in the Eucharist especially at the Sunday assembly, permeates and transfigures the time of each day, through the celebration of the Liturgy of the Hours, "the divine office."46 This celebration, faithful to the apostolic exhortations to "pray constantly," is "so devised that the whole course of the day and night is made holy by the praise of God."47 In this "public prayer of the Church,"48 the faithful (clergy, religious, and lay people) exercise the royal priesthood of the baptized. Celebrated in "the form approved" by the Church, the Liturgy of the Hours "is truly the voice of the Bride herself addressed to her Bridegroom. It is the very prayer which Christ himself together with his Body addresses to the Father.49
See further here #1174.
