I noted a tiny error on your site in the section dealing with rocket thrust and the LM engine leaving craters:
Early on you describe 1 pound as 2.2 kilograms. Elsewhere you got the conversions right.
(If yer can't trust 'im on this, yer can't trust 'im on anythin'!) [img]/phpBB/images/smiles/icon_wink.gif[/img]
Seriously, though, a very good site.