I don't understand why you are using 1260 days as the lower limit ministry which, in reality, is 42 months consisting of 30 days each, but you do not use 30 day months to get a lower limit age. You multiplied 30 years x 365.2422 which would seem to give the upper limit. However, if you multiplied 30 years x 360 (12 months of 30 days each) it would equal 10800 days (the lower age limit). Am I missing something?
If you add 1260 to 10800 =12060 as the lower limit age + the lower limit ministry.
Converting to 30 day months as used in Point #3, you get 12060/30 = 402 months. That is an 11.5 month difference from your 414.5 months.
30 years would be based on actual solar years within the bounds of lunar months. That's how they kept time, and that's how the feasts were fulfilled.
The 1260 and 1290 are based on prophetic times of ministry, such as the two witnesses. Those numbers are more mysterious, however they do seem to have short term intercalation to line up with the solar year, i.e. 1260 + 1290 = 2550 days which is 6.98 solar years, just short by a week. So I used both limits, i.e. the 3.5 years without the intercalation and the 3.5 with it to establish bounds. If we use the solar cycle for 3.5 years, that would be 1278 days, and 43 lunar months (to the nearest lunar month) that would be 1270 days well within the low and high limits I proposed.
For this reason, I prefer not to be dogmatic about interpreting the 70 weeks of Daniel, because as we see, there's all sorts of ways that the numbers can be construed, and I am honest enough to admit I don't understand that.
My premise is based on those 3 points:
1) That we know he died on a Passover some year (and that's a full moon festival),
2) that IF (I realize some may not agree) Revelation 12 describes an astronomical position, then that occurs at another feast, Trumpets,
3) and of course the number of days of Messiah, which my calculations just fine tune what most already accept: 33.5 years. These are not far-out concepts but rather straightforward IMO.
What people have to realize here is I took these things that I consider facts, and then derived the dates without previous knowledge what the outcomes would be. That's different than starting with dates, and then fashioning (interpreting) the bible to make it say that (
Eisegesis). Of course if they are true, they should agree with what we know historically (including so-called eclipses such as those at Herod's death), and I don't see any severe contradictions. Most historians will debate within a year or two or even three.
The most popular date today of the death of Christ is April 3, 33AD, and that's because that (along with the older accepted date of 30AD) works out that Passover was on a Friday, the day most still believe the crucifixion to occur. I'd say in the very least that if I am guilty of even the slightest amount of manipulating, then at the very least so are the rest of the scholars.