Lovemore, the prophecy is Jewish, and I have given you the Jewish interpretation to this Jewish Prophecy. Any other interpretation which is not Jewish is prone to fail at the onset.
Christian speculations about Jewish things are not evidences to the Truth. The only thing to be sure is that the Jewish exile in Babylon lasted for 70 years, and that's the basis for the prophecy of Daniel 9:24-27 to develop around.
I am a Jew, whose circumcision is in the heart. As it is written "And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live."
The exile for sure lasted 70 years. However Daniel was taken away in the first siege in the fourth year of Jehoiakim. The final destruction was in the 11th year of Zedekiah which was about 20 years later.
"The word that came to Jeremiah concerning all the people of Judah in the fourth year of Jehoiakim the son of Josiah king of Judah, that was the first year of Nebuchadrezzar king of Babylon;..." Jeremiah 25:1
"And this whole land shall be a desolation, and an astonishment; and these nations shall serve the king of Babylon seventy years." Jeremiah 25:11
The exile lasts 70 years, not the desolations. The desolations last 50 years, a jubilee period, according to the prophecy in Leviticus
"But if ye will not hearken unto me, and will not do all these commandments;..." Leviticus 26:13
"Then shall the land enjoy her sabbaths, as long as it lieth desolate, and ye be in your enemies' land; even then shall the land rest, and enjoy her sabbaths." Leviticus 26:34
The land enjoying her sabbaths refers to the seven sabbaths of Leviticus 25, which make up 49 years plus an extra jubilee year.
"And them that had escaped from the sword carried he away to Babylon; where they were servants to him and his sons until the reign of the kingdom of Persia: To fulfil the word of the LORD by the mouth of Jeremiah, until the land had enjoyed her sabbaths: for as long as she lay desolate she kept sabbath, to fulfil threescore and ten years." 2 Chronicles 36:20-21
These are Jewish scriptures saying that the 20 years are at the beginning of the 70 years.
Now what happens next? The commandment goes out:
"Now in the first year of Cyrus king of Persia, that the word of the LORD spoken by the mouth of Jeremiah might be accomplished, the LORD stirred up the spirit of Cyrus king of Persia, that he made a proclamation throughout all his kingdom, and put it also in writing, saying, Thus saith Cyrus king of Persia, All the kingdoms of the earth hath the LORD God of heaven given me; and he hath charged me to build him an house in Jerusalem, which is in Judah. Who is there among you of all his people? The LORD his God be with him, and let him go up." 2 Chronicles 36:22-23
This is the commandment from Daniel 9:23-27.
Jeremiah's 70 year prophecy is made the same year it began.
Daniel's 70 week prophecy is made the same year it began.
This then makes sense of the first 7 weeks of the 70 week prophecy. It is another jubilee period, during which the temple and the wall are rebuilt.
Oh how beautiful is the Word of God!
As a Jew, I don't trust history, which comes from men and not from God.
As it is written in the Psalms, It is better to trust in the LORD than to put confidence in man.