Here’s an explanation from the St Andrew’s Missal
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7:15 am Friday 16 December- Ember Friday in Advent
Confessions heard @ 6:55
Christmas Novena for 30 November through 24 December: begin – or resume – any day up til 16 December
Beginning on this feast of St. Andrew, the following beautiful prayer is recited by some religious fifteen times a day until Christmas. This is a very meditative prayer that helps us increase our awareness of the real focus of Christmas and helps us prepare ourselves spiritually for Jesus’ coming.