« A.U.C. 583 = 171 B.C. »
Livy 42.28.4 records that the elections for this year were held in a.d. XII Kal. Mart. and a.d. XI Kal. Mart. of A.U.C 582 = 172. These are days with nundinal letters of G and H respectively, regardless of whether that year was intercalary. Since A.U.C. 582 = 172 was in fact intercalary, the elections were held in Intercalaris and the letter of the market day is the same as that for Martius in this year. If there was no intercalation in this year, the nundinal letter for the market day in Intercalaris of A.U.C. 582 = 172 was C. If there was a 22 day intercalation it was A, if there was a 23 day intercalation it was B. Thus, the comitial data does not allow us to decide the length of this year.
Under the reconstructed Lex Acilia proposed here, it is not possible to have three consecutive intercalary years. Since A.U.C. 582 = 172 and A.U.C. 584 = 170 were both intercalary, it follows that this year was regular. Since the absolute Julian dates of A.U.C. 584 = 170 are known, this fixes the Julian dates of A.U.C. 583 = 171.
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