Genre: 
Full text: 
Caeli deus sanctissime qui lucidas mundi plagas candore pingis igneo augens decoro lumine | Quarto die qui flammeam dum solis accendis rotam lunae ministras ordinem vagosque cursus siderum | Ut noctibus vel lumini diremptionis terminum primordiis et mensium signum dares notissimum | Expelle noctem cordium absterge sordes mentium resolve culpae vinculum everte moles criminum | Praesta pater piissime patrique compar unice cum spiritu paraclito regnans per omne saeculum
Fulltext source: 
Breviarium Romanum (Rome 1632)
Notes: 
Urban VIII revision (1632 breviary); cf. 008283 for an earlier standard version (begins the same but has a few differences)