This was not very clear, but was all about precision.
To use a slightly different example, if someone wanted to describe the
construction of a building sometime during the Roman period (43-410), the
dating of this would be less precise than a similar dating for the Flavian
period (68-95). This could be indicated as 1 in 367 (0.0027) as opposed to 1
in 27 (0.037). All very mathematical.
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