>> “Actually, depending on when Zacharius, John the Baptists father served in the Temple, gives a possible date of...NOW OR, around Dec. 25th.” <<
Using the courses of service would deliver dates roughly 6 months apart, so December 25 is completely impossible.
Since Zeremiah served in the course of Abia, as stated in the scriptures, Sukkot is shown to be the date. But that should be no surprise, since the purpose of Sukkot was to prophecy the coming of the Messiach.
Exactly - a shadow picture, just as was Passover for the sacrifice. It's why the Almighty instructed us to always observe these dates!
They are also shadows of events to yet to come.