http://books.google.com.br/books?id=cGgWAAAAYAAJ&pg=PA298&lpg=PA298&dq=american+journal+of+astronomy&source=bl&ots=8CtqA8nZOw&sig=dNrcVpLG2wJAMKGWHgemxyreZJo&hl=pt-BR&ei=el6lSpnJK5DllAfEwv2PBA&sa=X&oi=book_result&ct=result&resnum=10#v=onepage&q=american%20journal%20of%20astronomy&f=false