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The Church Fathers · 725
On the Reckoning of Time
De Temporum Ratione
The Venerable Bede · c. 673–735
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What it is
A complete treatment of time — the day, the moon, the tides, the Easter cycle — closing with a world chronicle and an account of the six ages.
Why it lasted
It settled the computus for the Latin West and, by adopting Dionysius Exiguus's system throughout, made AD dating the European standard.
Where to read it
Public domain and free to read in full, though not held here. The archives below have it.
These open a search on each archive rather than a direct link, which is the honest way to point at an edition nobody here has checked line by line.
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