De saltu lunae

Incoming data

The catalogue entry for this text has not been published as yet. Until then, a selection of data is made available below.

Latin computistical treatise on the saltus lunae, a lunar ‘leap’ day which is omitted in calculations to bring the solar and lunar calendars back into alignment. In manuscripts, it is attributed to Columbanus, but his authorship seems unlikely as the text favours a Roman Easter reckoning, being based on the 19-year cycle of Dionysius Exiguus.

Manuscript witnesses

Karlsruhe, Badische Landesbibliothek, MS Ac. 132/cover 
Los Angeles, J. Paul Getty Museum, MS Ludwig XII 5 
Previously Malibu, Getty Museum, MS Ludwig XIII.5.
ff. 110v–114v  
Munich, Bayerische Staatsbibliothek, MS Clm 10270 
ff. 12v–13r  
Munich, Bayerische Staatsbibliothek, MS Clm 14569 
rubric: Lectio S. Columbani de saltu lunae   
ff. 26r–28r  
St. Gallen, Stiftsbibliothek, MS 250 
rubric: Sanctus Columbanus haec de saltu lunae ait   
pp. 112–114   
St. Gallen, Stiftsbibliothek, MS 459 
pp. 125–126   


Primary sources Text editions and/or modern translations – in whole or in part – along with publications containing additions and corrections, if known. Diplomatic editions, facsimiles and digital image reproductions of the manuscripts are not always listed here but may be found in entries for the relevant manuscripts. For historical purposes, early editions, transcriptions and translations are not excluded, even if their reliability does not meet modern standards.

[ed.] [tr.] Walker, G. S. M. [ed.], Sancti Columbani opera, Scriptores Latini Hiberniae 2, Dublin: Dublin Institute for Advanced Studies, 1957.
CELT – Epistulae (text): <link> CELT – Epistulae (translation): <link>
212–215 (text and translation); lxiii (introduction) Based on St. Gallen MS 250, with variants from Munich Clm 14569. This text is reprinted in PL Suppl. 5, 1609-1610.
[ed.] Meier, Gabriel, Jahresbericht über die Lehr- und Erziehungs-Anstalt des Benediktiner-Stiftes Maria-Einsiedeln für 1886-7, Einsiedeln, 1887.
30 (Appendix) Based on St. Gallen MS 250.

Secondary sources (select)

Warntjes, Immo, “Seventh-century Ireland: the cradle of medieval science?”, in: Kelly, Mary, and Charles Doherty (eds), Music and the stars: mathematics in medieval Ireland, Dublin: Four Courts Press, 2013. xiv + 249 pp + 16 (ill.). 44–72.
Ó Cróinín, Dáibhí, “The computistical works of Columbanus”, in: Lapidge, Michael (ed.), Columbanus: studies on the Latin writings, Studies in Celtic History 17, Woodbridge: Boydell Press, 1997. 264–270.