Jeffro
Your assessment of the early Neo-Babylonian period is correct, but JWs insert 20 years into the Neo-Babylonian period after Nebuchadnezzar’s reign, pushing back the years assigned to his reign. So it’s not as simple as querying Nebuchadnezzar’s conquest of Jerusalem ‘before’ his victory at Carchemish. What we, and all of scholarship for the period, know was 605 BCE, historical revisionists like ‘scholar’ and other JWs call 625 BCE.
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All that we have done is factored in the definite historic period of the biblical' seventy years' which proves that there is at least a gap in NB Chronology of at least 20 years and according to Furuli's research may be a longer gap.
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The Watch Tower Society vacillates between ignoring the problem - not attempting to defend 607 for decades - and occasional dishonest attempts to defend their view (like in 1981 when they said VAT 4956 was defective and unreliable, or 2011 when they said VAT 4956 completely supports their view). The fact is that the JW position is indefensible, so after JW apologists’ paltry attempts (such as their easily refuted claims about VAT 4956) at justifying their doctrine fail, they just fall back to the unbiblical mantra of ‘70 years of exile’. They don’t really care about the actual facts because of the powerful delusion connected to their end-times beliefs.
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No need for vacillation but simply keeping up with the fact that scholarship improves or advance over time so now we have a more positive view of VAT 4956 due to Furuli's research.
The 'unbiblical mantra of 70 years of exile' is well supported by major Jewish historians and others such as Rainer Albertz and is consistent with the subject of 'Exile' in the OT history.
We show our concern for facts and that is why we have published such books as Aid and INSIGHT which a complete history for the Divided Monarchy and NB Period also our facts are well presented in your pretty chart on JW Chronology which proves that we rely on all of the facts and nothing but the facts for we are a people of facts so to speak.!!!
scholar JW