« A.U.C. 684 = 70 B.C. »

The number of intercalations in the early 60s can be determined from data given by Cicero in his speeches against Verres' mismanagement of affairs in Sicily during the period A.U.C. 681-683 = 73-71.

Neither datum is precise in isolation, but they can be used to reinforce each other, since both were subject to the same number of intercalations. The following tables estimate the dates for Kal. Sex. A.U.C. 683 and Kal. Feb. A.U.C. 684 by counting possible intercalations back from a.d. XV Kal. Oct. AUC 687 = 28 or 29 September 67. Possible matches are highlighted in blue; best matches are bolded.

Intercalary Months   Intercalated days    Julian date of Kal. Sex. A.U.C. 683     Julian date of Kal. Feb. A.U.C. 684  
  A.U.C. 684-697                                 

              0                     0                              27-28 Sep. 71                               22-23 Mar. 70
              1                  22-23                           4-6 Sept. 71                                 27 Feb. - 1 Mar. 70
              2                  44-46                           12-15 Aug. 70                               4-7 Feb. 70
              3                  66-69                           20-24 July 70                               12-16 Jan. 70
              4                  88-92                           27 June - 2 July 70                         20-25 Dec. 71

The model favours two or three intercalary months in this period but is not sensitive enough to distinguish between them. Cicero's data does not allow us to determine the lengths of these intercalations or their dates.

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