Hi Narkissos:
c. the time of desolation of the land of Judah, which is historically unaccurate (since the exile only lasted about 50 years, cf. the 1st "7 weeks" of Daniel 9, and did not imply a complete desolation to begin with), but seems to be in view in 2 Chronicles 36 (and later in Josephus, although he does know from Berossus the actual duration of the exile). I tend to think that this third interpretation (c) was worked along with the first one (a) into the extant text of Jeremiah 25:11, for the part: "This whole land shall become a ruin and a waste, and these nations shall serve the king of Babylon seventy years."
You forgot to mention Josephus' interpretation of the 70 years as beginning with the last deportation and ending the 1st of Cyrus. It doesn't matter if it is believed to be accurate or not. That is precisely where he places the 70 years in fulfillment of Jeremiah's prophecy, thus the 70 years of "servitude" specifically are for the "poor people" remaining from those killed off in Egypt. He clearly indicates the land lay desolate for 70 years after this last deportation. That is a clear contradiction of the shorter NB Period. But it is quite consistent with the Bible's reference at 2 Chronicles that those last deported of those "remaining from the sword" would serve the kings of Babylon for 70 years while the land paid back its sabbaths.
Therefore, there is no choice but to resolve the discrepancy. One or both are giving erroneous information. One or both have revised their records. Of course, when we start to look at the Babylonian records and see the three main texts, the Babylonian Chronicle, Nabonidus Chronicle and the Cyrus Cylinder are all dated during the Persian Period it becomes clear we have to address issues of the Persians revising the Babylonian records. The VAT4956, though confirms that the original dating for year 37 of Nebuchadnezzar fell in 511 BCE. So the 587 BCE dating is DEFINITELY FICTITIOUS just based on the double-dating int he VAT4956 alone. Now, obviously, there may be a lack of scholarly expertise to appreciate what is going on but that's not my problem. Anybody can use an astronomy program and check out the details themselves.
On the other side of the fence though, Biblical scholars like Martin Anstey and Phillip Mauro have concluded that the Bible's "absolute" timeline must date the 1st of Cyrus to 455 BCE to fulfill the 70 weeks prophecy. THAT becomes an interesting comparison for the VAT4956 511 BCE dating and Josephus' 70 years beginning in year 23. Why? Because the RELATIVE CHRONOLOGY and ABSOLUTE CHRONOLOGY work out precisely the same.
That is, if year 37 falls in 511 BCE then year 23 falls in 525 BCE. If that is the beginning of the 70 years, then the 1st of Cyrus falls in 455 BCE. 455 BCE is the absolute date for the beginning of the 70 weeks prophecy, which some feel only Cyrus can fulfill since the city and temple began to be rebuilt that year and the Bible says the prophecy begins when the "word goes forth to rebuild Jerusalem."
So some of us have moved on based on the VAT4956 alternative confirmation for redating the entire Neo-Babylonian Period.
In addition, when Zechariah 1 and 7 clearly show the Jews still in exile 70 years after the fall of Jerusalem for year 2 of "Darius" and 70 years after the mourning for Gedaliah in year 4, it is clear Zechariah is supporting Josephus' 70-year application since the Jews would have still been in exile another 2 years if the 70 years began in year 23, 4 years after the fall of Jerusalem. Thus Zech 1 and 7 is a reference to the reign of Darius the Mede who began to rule at Babylon after the Medes and Persians conquered that city. Thus Darius the Mede rules for 6 years before Cyrus comes to the throne, which the Bible supports.
So at this point, some of us who have looked at the astronomical texts feel the 587 BCE chronology is faked and not to be taken seriously, and find compatibility with the Bible using the VAT4956's reference to 511 BCE for year 37 of Nebuchadnezzar, and Josephus' assignment of the 70 years beginning with the last deportation. So it doesn't really matter how effective one is able to match up 70-year scenarios with the 587 BCE or 539 BCE chronology since those dates have been dismissed by the VAT4956 already as fake. The VAT4956 proves those are the wrong dates. 587 BCE is just old news at this point.
But even so, Martin Anstey has a following, of which I'm one, who believes that 455 BCE must fulfill the 70 weeks prophecy and thus the Bible's timeline in comparison with the NB timeline would be radically different anyway. We feel the JWs compromised with secular chronology by using 539 BCE as a "pivotal date" for their chronology, though it seems to have worked out for them in relation to 1914, but not according to the Bible. It is clear the last deportation triggers the 70 years, and they avoid with a passion acknowledging those last deported were the last remaining ones of the official nation who had ran down to Egypt, even though that is specifically noted by Josephus. So they are liars and dishonest and the "evil slave" just as the Bible calls them. 1914 doesn't work out even on a "relative chronology" basis because the 70 years begins when the land is totally empty and desolate. And Jeremiah 44:14,28 clearly says those who had ran down to Egypt who "escaped from the sword" would return to Judea. So Jews were in Judea right up until the 23rd year before the land was completely desolate. To avoid that concept, the WTS presumes some Jews were scattered about after Gedaliah was assasinated and it is these who were gathered from the surrounding area (specifically avoiding Egypt) that were deported. They give no explanation as to what happened to Jeremiah and Baruch who certainly were not killed. What happened to them? I'll tell you. They were part of those last deported in year 23! So 607 BCE is a double joke, both via Jewish traditional history and the Bible.
The Bible is vindicated totally though, when you date year 1 of Cyrus to 455 BCE and thus year 23 to 525 BCE since year 37 falls in 511 BCE which is confirmed by the VAT4956!! So that's great!
So it's sort of odd seeing so many still discussing dating that already has been clearly corrected and dismissed by the key astronomical texts involved as far as secular evidence. But also a comfortable interpretation of 455 BCE for the 1st of Cyrus for those who follow Anstey now, especially now that we know so much about the actual revisions of the Persian Period and Xerxes faking his death and claiming he was Artaxerxes. So it boils down to either people are not that bright or not that honest if they don't face the reality of the evidence in place now as to what happened and why there are these discrepancies. It's almost funny.
Anyway, to each his own, as they say!
JC