Well, the first one is simple - I'm still planning on sometime between Halloween and Christmas for releasing ATH Book 5. I'm currently writing Chapter 12. As I've told my editors, I had a bit of a real life funk for a bit, plus just getting the plot points AND the math figured out correctly.
Why did I have to figure out math? Simple. Go watch 'Armageddon' or 'Deep Impact'. Then consider that they got SO much wrong in both of those movies that they really should qualify as fantasy and not science fiction. (That's the polite way of saying in 'Armageddon', the Earth would have actually been destroyed - as in turned into the newest asteroid belt orbiting the Sun - and in 'Deep Impact', it would've simply wiped 99+% of all life off the planet, sort of like Chicxulub.)
So, when the book does come out, the math and results will be as close and accurate as I can get it.
Second one is also simple, relatively speaking. I'm posting this on September 10, 2022. I still remember, and will never forget, September 11, 2001.