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Morgan H R Motions in the solar system
MARS POEM W E DUCKWALL
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American appeared astronomers average birds brightness changes Cleveland close color comet complete computed constant continue correction cycle determined direction discussion distance earth eclipse effect elements error established fact fall field Figure give given important included increase indicated intensity interest June known later latitude length less light longitude magnitude March maximum mean measured meeting meteorites meteors method Michigan miles Miss month moon motion Mount move nature nearly night Notes object observations Observatory obtained original passed period photographic photographic magnitudes photometry planets plate position possible present probably problem Professor published recent recorded reference region reported satellites scale seen Society solar standard stars surface tables taken telescope tion University variable visible