take 70 years off 539BC
My calculator must be broken... won't give me 607 no matter how many times I punch it in. Keeps me giving me 609... Hey... isn't that when all the historians say Babylonian destroyed Assyria's capital, Harran and became world power?? What a co-incidence!! (No, I really didn't use a calculator.)
According to Isaiah's Prophecy volume 1 page 234, when "Tyre must be forgotten seventy years," (Isaiah 23:15) the 70 years "Evidently" does not fully apply to Tyre. Why then should any reference to Jerusalem involving 70 years fully apply the entire 70 years to Jerusalem? The Isaiah's Prophecy book makes it clear that 1) the '70 years' of Jeremiah 25 indeed refers to a lot of nations (as is quite evident just by reading the bible anyway) and 2) the entirety of a 70-year period need not be fully applied to any one nation even when the nation is explicitly referred to with reference to that 70 year period.