jwposter:
How does picking April 23 of -511 as the first day of the first month get derived from the Solstice being indicated on the 9th day of the 3rd month?
š If you don't understand why, you're definitely not qualified to be making a vast rewrite of all of antiquity.
The 9th day of the 3rd month is necessarily two full lunar cycles plus 9 days (inclusive) after the 1st day of the 1st month. A lunar cycle is 29.5 days. The solstice was on 29 June in 512 BCE. 67 days before 29 June is 23 April.
Please go away.