Background
foundationsforfreedom.net/References/OT/Historical/Nehemiah/Nehemiah00HistorIntro.html
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1000 Days and 1000 Years of William Miller for the First Resurrection
William Miller from "31 A.D. to 34 A.D. = 1000 Days" (Circled in Green)
Date 538 A.D. = 1000 Years (roughly) from 457 B.C.
(1000 Days Took Place After the Crucifixion......(AFTER Jesus was taken out of the City to be Crucified).....and this Was 1000 Years Before the Jewish People began to move into Jerusalem from 538 A.D.
1. When the Jewish People began to Move in Mass into Jerusalem this marked "1000 Years"
(457 B.C. to 538 A.D. is about 1000 Years, in Orange)
2. When Jesus was Moved out of the City to be Crucified this Marked "1000 Days"
(31 A.D. to 34 A.D. is about 1000 Days, in Green)
3. (538 B.C. to 538 A.D. was about 1000 Years and 70 Years for Daniel's Prophecy, for the first 1000 Year Resurrection (538 was some parallel exactly in B.C. and A.D.)
-End of Background (Jesus Moved out = 1000 Days.........Jewish People Moved in Mass = 1000 Years...........for the first resurrection that is the supposed pattern)
Your timeline that shows the start of the 2,300 years of the Gentiles trampling God's sanctuary and His earthly hosts is out by around 200 years. The start of the 2,300 years was not the the year 457 BC as you have shown but rather was during the time of the Grecian Empires' dominance of the known world.
Your first diagram bears no resemblance to what is recorded in Daniel 8 where we are told that the little horn who is given an army to commence the trampling of God's sanctuary and earthly hosts began after the death of Alexandra the Great who died in 323 BC and not until the four divisions of Alexandra the Great's empire was firmly established as Daniel records that the four horns that replaced the horn of Alexandra the Greats had grown quite large and then out of one of the horns, the little horn appeared, a number of years later, which I would suggest occurred some 70 or so years later, which would put the beginning of the trampling of God's Sanctuary and His earthly hosts at around 250 BC.
Now since the Temple was pulled apart in 70 AD, God's earthly hosts, the nation of Israel has been trampled by many nations and people groups every since, and is still occurring even during these present time.
Some people argue that the 2,300 mornings and evenings occurred around 160 BC because the trampling of the temple from when it began until it was cleansed took 2,300 days. However, around 230 years later the temple was again trampled because the Jews themselves, as Jesus had said they would in John 2:19 would cause the Temple to be destroyed and ploughed by the Roman army and the Israelites sold off as slaves to the nations within the Roman Empire at that time. Sadly, people tend to focus on the Temple's trampling by the nations around Jerusalem and do not consider the continuous trample of God's earth Hosts, the nation of Israel, by all of the nations of the earth since 70 AD up and until this present time in which we are living.
Jesus in Matthew 24:32 tells us the time span from when the Fig tree, i.e. the nation of Israel, again begins to bud leaves, until it is redeemed by God once more which can be measured from when the fig tree begins to bud leaves before the end of the winter season , in what we call the early Spring, until the beginning of the Summer season, when the great harvest of souls will begin.
Paul in Romans 11:25-26 also tells us that when the fullness with respect to time of the Gentiles is completed, that after this time, all of Israel will be saved.
In Daniel 2's statue prophecy, we also learn that during the time of the kings of the fifth segment of the statue, that a stone, i.e. the foundational stone Christ spoke of during His ministry, will come down from heaven and become a great mountain that will fill the whole earth. 2:35. Then in 2:44-45 we also learn that God will establish His Everlasting kingdom on the earth during the time of these kings, and that His Kingdom and its foundational truth will consume and break all of the Kingdoms that existed in the five segments of the statue.
I would suggest that the writer of this folly did not consider what the scripture tell us carefully enough to arrive at historical indicators that confirm what the scriptures teach. There is no historical event that I can see in
1844 - Wikipedia that corresponds with Biblical prophecy that would confirm the year 1844 as being biblically significant..
As such I would suggest that the first chart is not a good representation of biblical prophecy. It also contains the error of being 1 years out with the 490 years that Judah and Jerusalem had been given to repent of their iniquities before God. The error being that they have subtracted 1 year from the referenced times given between 457 BC and 34 AD to agree with the specific time span of 490 years. I would also suggest that the chosen start and end years for the 490 years for Israel to put an end to their idolatrous worship does not match up with the prophecy that in fourn in Exodus 20:4-6.
Shalom