It's an issue that gets more complex as you go into it! Jews in the OT had a lunar calendar, which was (IIRC) 29.5 days, so every three years or so they added a 13th month to keep the festivals aligned with the time of year they were associated with.
Passover for instance was associated with the festival of the first fruits, and you had to have that festival in spring time, for obvious reasons! In fact, the original name for the first month of the Hebrew year was abib, which is the word for barley a the stage right before harvest. We know that from Exodus, when the plague of hail was said to have destroyed the barley crop since it was abib, but not the wheat, which is a later crop (described as still green) and could come back (with reduced yields) since it hadn't formed a seed head as yet.
Rush told me once that the Hebrews used some of the New Moon festivals, which are mentioned in the OT but not authorised as official, commanded festivals, to help keep the liturgical year on track with the actual seasons. After looking into it, I don't think that was right, since the 13th month, which was decided by observing the barley harvest, added every third year OR SO would have keep the seasons and holidays in line.
So, if anyone has followed this, and has studied this, perhaps they can answer a question I have. Did adding the 13th month change the 7 day cycles or not? I presume no, it probably didn't.
Tim Vaughan
Member, Redeemer Presbyterian, OPC,
Santa Maria
California
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