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visits member for 1 year, 11 months
seen Aug 31 '12 at 16:05

Aug
31
awarded  Scholar
Aug
31
accepted How to learn celestial mechanics?
Aug
31
comment How to learn celestial mechanics?
Thank you for you help.
Aug
31
comment How to learn celestial mechanics?
Thank you very much, Rody.
Aug
31
awarded  Student
Aug
31
asked How to learn celestial mechanics?