Moses was born premature at 6 months and was concieved on Tisha B'Av. He was born on 7 Adar, the same date he died on 120 years later. Of course that's possible because Tisha B'Av wasn't a fast day then and it was permitted to have sexual relations on that day.
interesting..
but midrash is not as solid as the written torah, and also, And in your own knowledge, to be able to look things up, it is important to remember where it says things. Or you becomes what rashi called "a basket of books". So it is important to say if you are quoting a midrash. And not to mix midrash and pshat, without saying pshat says x, midrash says y
sometimes there can be another midrash that says NOT y. Sometimes.
somebody like you, who has such an organised mind, should not be a basket of books!
Being born on the 7th of adar, and going back or forward some number of months, takes us to somewhere in Av. But not necessarily the 9th. It might be possible on a particular configuration of some months being 30 days and some being 29 days.
Thus, you would need a separate tradition that Moshe was born on tisha beav.
regarding what you said.. when it comes to calendars.. I gotta look at the steps!! (I know the facts about how the calendar works, but things can go wrong in calculations!)
Moshe was born 3 months premature.. I think that`s what you meant?
You say conceived on 7 Adar
So 6 months of pregnancy.. (I think is what you meant with the 6 months comment)
7 Adar was the end of the 6th month of pregnancy..
so Tirshri (like, around 7 tishri) was the end of the first month of pregnancy.
so Ellul was the beginning of the first month.
Maybe I did something wrong - I often do with calendars - we seem to be off by one. Why do you say Av ?