Starting second semester, Aquinas & St. Mary’s School Masses will be celebrated Ad Orientem (towards the East). Very simply, this means that the priest will be facing the same direction as the people during Mass, especially during the Eucharistic Liturgy. The priests have been teaching a little about this upcoming change in their religion classes.
Why the change? While there are many benefits to praying the Mass ad orientem, the main reason is that it will help all; priests, staff, and students, to have a more prayerful and reverent experience during the Holy Sacrifice.
This change should not be misunderstood as the priest “turning his back on the people.” Rather the emphasis in this ancient liturgical practice is that the priest is leading the people in prayer as all face the same direction in a common act of worship toward God.
More resources here
“5 thinks to remember about Ad Orientem” here