« A.U.C. 706 = 48 B.C. »

Cicero, Ad Atticum 10.17, tells us that the vernal equinox in 705 A.U.C. = 49 was around a.d. XVII Kal. Iun., which must therefore be in late March 49. Given a 90 day intercalation in A.U.C. 708 = 46, it is not possible to intercalate any months in A.U.C. 706 or 707, each of which must therefore be 355 days long.

Since the Julian dates of A.U.C. 708 = 46 are known, this result fixes the Julian dates of A.U.C. 706-707 = 48-47.

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