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
That astronomy more especially, which ministered, in the nomenclature of the stars, to the thoughtless erudite dilettantism of the age and, in its relations to astrology, to the prevailing religious delusions, was regularly and zealously studied by the youth in Italy, can be proved also otherwise; the astronomical didactic poems of Aratus, among all the works of Alexandrian literature, found earliest admittance into the instruction of Roman youth. To this Greek course there was added the study of medicine, which was retained from the older Roman instruction, and lastly that of architecture--indispensable to the genteel Roman of this period, who instead of cultivatingthe ground built houses and villas.
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Reference address : https://www.ellopos.net/elpenor/rome/5-12-religion-culture-literature-art.asp?pg=10