« A.U.C. 542 = 212 B.C. »

P. Brind'Amour, Le calendrier romain 164f. points to several, if imprecise, seasonal synchronisms in this year.

These indications, loose as they are, suggest that this Republican year was a little ahead of the Julian year at this time. Further there were 5 intercalations between A.U.C. 539 = 215 and A.U.C. 564 = 190, the most recent year whose dates are certain, and 2 between A.U.C. 551 = 203 and A.U.C. 564 = 190.

The following table gives the possible date ranges for Id. Mart. and Id. Mai. A.U.C. 542 assuming 2-5 intercalations between this year and A.U.C. 564 = 190.

Number of Intercalations   Number of intercalated days            Julian dates in A.U.C. 542
     A.U.C. 542-564                                                           Id. Mart.               Id. Mai.

              2                               44-46                        16-18 May 212            15-17 July 212
              3                               66-69                        23-26 April 212            22-26 June 212
              4                               88-92                     31 March - 4 April 212    30 May - 3 June 212
              5                              110-115                     8-13 March 212            7-12 May 212

There is clearly only one possibility: there were 5 intercalations between this year and A.U.C. 564 = 190.

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