johnamos
Agreed. Jeremiah's prophecy herein is addressed to five surrounding nations of Judah and including the nation of Judah that they could escape Jehovah's judgement by submitting in servitude to the then reigning king, Nebuchadnezzer. In this chapter, there is no connection of the 'seventy years as such as in the case of the preceding chapter 25 which was also addressed to the nations including Judah which altogether had to serve Babylon 70 years. When one considers the duration of the Babylonian monarchy from Nebuchadnezzer to Belshazzar you get an overall period of 66 years which could be rounded up to 70 years representing the Babylonian Dynasty. This scenario would easily account for the 70 years ascribed to Tyre's servitude as a round number.
However, Jeremiah's texts of the seventy years are applicable to Judah alone giving precise details as to its chronology and its nature that of not only being one of servitude but of exile and desolation with a precise beginning and end. These factors are not present with those oracles given to the Nations roundabout.
There is simply no basis, in fact, to claim that the 70 years for Judah ended in 539 BCE or began in the fuzzy date of 609 BCE. How you apply to the other nations the servitude to Babylon for 70 years is a matter of speculation for the Bible provides no details on that subject.
Current scholarship of late 2018 dismisses the 539 BCE interpretation of Babylonian domination solely applicable to the seventy years of Jeremiah arguing rather that this period refers to the Exile ending ith the Return under Cyrus in 537 BCE
Again I repeat in the light of the 70 years' textual corpus, the theory that the 70 years ended in 539 BCE is impossible and is simply bunkum!!!!
scholar