Allo les francais!
Il y a environs deux a trois annees que je me trouvais sur ce topic de forum; et donc ca me coute beaucoups d'efforts de pas changer en anglais,mais tenir compte de Mr. Clavius je fesais des efforts.
For multispeaking people: As I am a technician and being very occupied on a dutch forum,named :
http://www.wetenschapsforum.nl
I got an interesting site, that has information on a very bread level;I use it for solving algebraic formules and making integral calculations and diagrams,but you can find several things on the level of astronomy.
I'm sorry for Clavius,it is british written,but learning some british words can be helpfull to visit and research the site,that I put on the level astronomy,but one can change on it:
http://www.wolframalpha.com/input/?i=astronomy+moon
And something about your nativ country,possibly interesting:
http://www.wolframalpha.com/input/?i=France&lk=1&a=ClashPrefs_*Country.France-