Solis ypapanti celebremus festa tonanti

Source: 
Sankt Gallen, Stiftsbibliothek, 390
Folio: 
008
Sequence: 
14
Feast: 
Purificatio Mariae
Office/Mass: 
X
Genre: 
W
Cantus ID: 
800570
Mode: 
?
Manuscript Reading Full Text (standardized spelling): 
Solis ypapanti celebremus festa tonanti ubera lacenti dat filia cuncta cibanti
Manuscript Reading Full Text (MS spelling): 
Solis ypapanti celebremus festa tonanti ubera lactenti dat filia cuncta cibanti
Indexing notes: 
"ypapanti" is the Greek term for presentation; what is this chant? (marked as "V");