Knowing that after the 1st year BC. followed immediately by the 1st year A.D. Chr., determine whether the 45th year BC

Knowing that after the 1st year BC. followed immediately by the 1st year A.D. Chr., determine whether the 45th year BC was a leap or simple year, i.e. year when the Julian calendar was introduced?

Since after the 1st year BC Chr. followed immediately by the 1st year A.D. Chr., that is, there was no zero year, then the 45th year BC. should be considered a leap year.

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