Source: PL-Wn 12720 V Antyfonarz opata Mścisława z Tyńca, pars de temporeFolio: 0046vSequence: 5Feast: Nativitas DominiOffice: MGenre: APosition: 1.2Cantus ID: 005101Mode: 8Differentia: G1Full text: Tamquam sponsus dominus procedens de thalamo suoNotes: ps Caeli enarrant