The feast of the Beheading of St. John the Baptist is of greater - double rank (also referred to as double major). The feast began with first Vespers yesterday, which we have 'dissected' in a post below. At Mattins there are nine lessons, the ninth lesson is of the commemorated office of St. Sabina.
At Lauds and the Hours the festal psalms are sung. At Lauds there is a commemoration of St. Sabina.
At Mass the Gloria is sung and a commemoration made of St. Sabina. In second Vespers a commemoration is made of the following day's feast, St. Rose of Lima and Sts Felix and Adauctus. Festal Compline completes the day.