Let me see how succinct I can be:
Matthew says Joseph was afraid to take Jesus into Judea because of Archelaus. Luke says Joseph left Jesus in Galilee every year at Passover time, until he was 12. I say these two things have got to be related! Archelaus left Judea forever in the middle of 6 AD. Therefore, Joseph took Jesus to Passover in March, 7 AD. Jesus might have turned 13 the day they got back from that trip, but he was "12" while they stayed at the festival.
This is a new place to start all chronological work on the Lord's life... If true, then Jesus was born somewhere between April of 7 BC and April of 6 BC. The year 7 BC is also when Saturninus governed Syria (and held a census, according to Tertullian). The year 7 BC also fits Kepler's theory on the star of Bethlehem. AND, if 7 BC is Jesus' first calendar year on the planet as a human being, then 33 AD was his 40th! Finally, if Jesus was born in May of 7 BC, then it's possible the ascension took place very near his 39th birthday, which of course would be the very first day of his 40th year. (Not to put too much weight on numerology, of course!) ;)
I get emotional thinking that God needed to "prove" his Son's humanity for 40 years, but the Father brought him home at the start of that 40th year. Enough was enough. One day of that year counted as much as the whole year. ("Part of an omer is all of an omer.")
In May of 33 AD, after 39 years and at least one more day, the Father simply couldn't stand to be that apart from his son any longer.
Now, that's deeply touching to me. But numerology isn't why I believe this is true. I believe it because of the Math. If Matthew 2:22 explains Luke 2:41-42, then that puts Luke 2:41-51 in 7 AD, which puts Jesus' birth sometime less than 12 months prior to March of 6 BC. So Jesus was born as early as April of May of 7 BC. And then, yeah, his 40th year started as early as April or May of 33 AD.
I still can't believe nobody else ever said this before... but I'm saying it now.
I believe this gives us a new beginning for chronological work on the Lord's life, and perhaps the entire New Testament.
Ask me a question! :)