Texts
Influential Latin treatise by the Northumbrian monk Bede on the methods of calculating time and the construction of a Christian calendar (computus). The work was preceded by Bede's briefer treatment of the same subject known as De temporibus.

Manuscript witnesses

Text
Angers, Bibliothèque municipale, MS 477 
Fragments. Manuscript contains glosses in Old Breton.
ff. 44v–85v  
MS
Oxford, Bodleian Library, MS Bodley 309 
rubric: Incipit prefacio Bedae presbyteri de natura rerum et ratione   
f. 3v–f. 61v
MS
Oxford, Bodleian Library, MS Bodley 309 
rubric: De etate lunae monstranda per tria alfabeta argunentum   Ch. 23.
f. 80r
MS
Oxford, Bodleian Library, MS Bodley 309 
rubric: De lunae cursu per xii signa et per litteras demonstranda argumentum   incipit: Si quis vero   Ch. 19.
f. 80r–f. 80v
Text
Vienna, Österreichische Nationalbibliothek, MS 15298 
Fragment, with marginal and interlinear glosses in Early Irish and Latin
ff. 1–4  
MS
f. 3

Sources

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.] Jones, Charles W. [ed.], Beda Venerabilis. De temporum ratione liber, Corpus Christianorum Series Latina, 123 B, Turnhout: Brepols, 1977.
[tr.] Wallis, Faith, Bede: The reckoning of time, Liverpool: Liverpool University Press, 1999.

Secondary sources (select)

Darby, Peter, Bede and the end of time, Studies in Early Medieval Britain and Ireland, Farnham, Surrey, Burlington, VT: Ashgate, 2012. xv + 261 pp.
Lambert, Pierre-Yves, “Les gloses en vieux-breton aux écrits scientifiques de Bède, dans le manuscrit Angers 477”, in: Stéphane Lebecq, Michel Perrin, and Olivier Szerwiniack (eds), Bède le Vénérable: entre tradition et posterité, 34, Villeneuve d'Ascq, 2005. 309–319.
Hleno.revues.org: <link>
Lambert, Pierre-Yves, “Les commentaires celtiques à Bède le Vénérable [part 1]”, Études Celtiques 20 (1983): 119–143.
Persée – Études Celtiques, vol. 20, 1983: <link>
Lambert, Pierre-Yves, “Les commentaires celtiques à Bède le Vénérable [part 2]”, Études Celtiques 21 (1984): 185–206.
Persée – Études Celtiques, vol. 21, 1984: <link>