The paper The Prophecy of Prophecies: Correcting Harold Hoehner Interpretation of Daniel’s 70 Weeks has been catching my eye. The view presented hinges on a few things described by the author that I don't have enough knowledge or skill to verify. For this reason, I'm reaching out.
Nehemiah is using a spring-to-spring calendar. This is the only way Nehemiah 1 can take place in the same "20th year". If Nisan was used as the new year (month 1) then it wouldn't be possible as Chislev would be in a different year.
Although 465 BC is Artaxerxes' "first year", year 1 wouldn't have been counted until his first full calendar year of rule, so instead of 445 BC being his 20th year, it would have been 444 BC.
Aramaic papyri which were excavated from the city of Assuan appear to indicate that in 446 BC, the Jewish months Tishri and Kislev began on September 19 and November 15, respectively. In 1942, historians Richard Parker and Waldo Dubberstein attempted to reconstruct the Jewish calendar of the fifth century BC by extrapolating data from the materials they had available to them at the time. However, they mistakenly assigned Tishri and Kislev of 446 BC as occurring one month later than what the ancient papyri from Assuan indicate. If the calendar constructed by Parker and Dubberstein is adjusted to correlate with the Aramaic papyri by being shifted backward one month, Nisan of 444 BC would begin on March 4. This is consistent with astronomical calculations which show that a new moon would have been visible after 10 PM on March 4, so a Jewish month would have begun on or shortly after this date. Hence, both lunar and historical data support a start date for Nisan of 444 BC to be approximately March 4.
March 4th as Nisan 1 seems to be extremely early, but it would be cool if this interpretation is accurate. Is this accurate dating?