Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
This view accords
with the fact that the individual names of the months--which can
only have originated after the month was viewed as part of a solar
year--particularly those of March and of May, were similar among
the different branches of the Italian stock, while there was
no similarity between the Italian names and the Greek.
It is not
improbable therefore that the problem of laying down a practical
calendar which should correspond at once to the moon and the sun--a
problem which may be compared in some sense to the quadrature of the
circle, and the solution of which was only recognized as impossible
and abandoned after the lapse of many centuries--had already employed
the minds of men in Italy before the epoch at which their contact
with the Greeks began; these purely national attempts to solve it,
however, have passed into oblivion.
