Would I have to enlist the aid of secular history for this project? In this project, biblical statement will always have highest authority, but where this might lack clarity for the purpose at hand, would evidence from other sources be needed? 'History' was never (at all) one of my favorite school subjects, but through the years I have come to see its value; indeed its indispensability. Accurate historical information is often a prerequisite to finding the truth of a matter. Would it be helpful now?
In addition to my excitement, I will readily admit to a degree of trepidation at the prospect of real disappointment. Still, I have never been one to cower after my mind has been set. If there is anything that I can appreciate about myself it is my valuing of Truth above all; whatever the ramifications might be that a truth may bring. I believe very much that, as Jesus said, "The truth will set you free." (John 8:32)
And oh yeah, there was one decision I had to make regarding which specific Decree to Restore and Rebuild Jerusalem is the one referred to by Daniel the Prophet. But even this was not difficult since (at least for me) the evidence is plainly much stronger for one above the others. This was also the single instance where I had to rely on the historical record to ascertain the date when that decree was proclaimed. But I will have the dating methodology laid out below the chart, for you to go through.
My suggestion is that you take all the time you need going through the chart. Go through it multiple times if you wish; as many times as is needed in order to achieve clarity. Make mental notes (or write them out) where you might have questions and then go through the Dating Methodology below the chart. Let's get started.