Hac die quam fecit Dominus, Solemnitas solemnitatum, et Pascha nostrum Resurrectio Salvatoris nostri Jesu Christi secundum carnem.
The wonderful words above are sung at Prime today, and indeed were sung by Rubricarius this morning at the same, before the reading of the entry in the Martyrology for the following day.
Holy Pascha is a Double of the First Class with a privileged Octave of the first Order. Mattins was described in the previous post. The day's Office begins this morning with Prime. There is no hymn at the Hours during the entire Octave in the Roman rite. At Prime psalms 53 and the first two stanza of Ps. 118 are sung to a special form of Tone 2. Haec Dies is sung after the psalmody and then everything else is omitted up to the collect Domine Deus omnipotens. The Martyrology is then sung, starting with the verse indicated above. Then Santa Maria etc is sung, the collect Dirigere et sanctificare etc and the short lesson Si consurrexistis. Terce, and the other Little Hours, are even more simple in their structure. At Terce the usual stanzas of Ps. 118 are sung to the special Tone 2 form followed by Haec dies and the collect of the day.
Mass is sung after Terce. Instead of Asperges me the Paschatide Vidi aquam is sung today and all other Sundays in Paschaltide. In the great Mass of Easter, Resurrexi, the Gloria is sung, one collect is sung. Haec dies is sung as the Gradual. The sequence Victimae paschali laudes is sung after the Alleluia. The Creed is sung and Ite missa est alleluia, alleluia is sung as the dismissal.
Sext and None have exactly the same structure as Terce. At Vespers the antiphons sung at Lauds are sung with the usual Sunday psalms. Haec dies is sung in place of the chapter, hymn and versicle & response. The solemn tone is used for Benedicamus Domino, alleluia, alleluia.
At Compline the usual psalms are sung to Tone 8G without any preceding antiphon, followed by an antiphon consisting of Alleluia, alleluia, alleluia, alleluia. This is followed by the Nunc dimittis sung to the Paschal Tone 2, without antiphons. Haec dies is then sung followed by the collect Visita quaesumus etc and then, as yesterday the antiphon Regina coeli etc.