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
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
So fixed was the association of torture with this condition of the shades, that there was even provided a redemption from it, which after certain mysterious offerings transferred the poor soul to the society of the gods above. It is remarkable that, in order to people their lower world, the Etruscans early borrowed from the Greeks their gloomiest notions, such as the doctrine of Acheron and Charon, which play an important part in the Etruscan discipline.
But the Etruscan occupied himself above all in the interpretation of signs and portents. The Romans heard the voice of the gods in nature; but their bird-seer understood only the signs in their simplicity, and knew only in general whether the occurrence boded good or ill. Disturbances of the ordinary course of nature were regarded by him as boding evil, and put a stop to the business in hand, as when for example a storm of thunder and lightning dispersed the comitia; and he probably sought to get rid of them, as, for example, in the case of monstrous births, which were put to death as speedily as possible.
But beyond the Tiber matters were carried much further. The profound Etruscan read off to the believer his future fortunes in detail from the lightning and from the entrails of animals offered in sacrifice; and the more singular the language of the gods, the more startling the portent or prodigy, the more confidently did he declare what they foretold and the means by which it was possible to avert the mischief. Thus arose the lore of lightning, the art of inspecting entrails, the interpretation of prodigies--all of them, and the science of lightning especially, devised with the hair-splitting subtlety which characterizes the mind in pursuit of absurdities.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=35