Popular Astronomy, Volume 49

absorption aërolitic Amateur Astronomers American appeared Arizona Astronomical Society atoms August average brightness College color comet computed constellation contraterrene craters Cygni distance earth eclipse energy Ephemeris equator faint Figure Harvard Harvard College Observatory Harvard Observatory interest interstellar interval January July June Jupiter kamacite latitude light curve lines longitude luminosity magnitude Mars mass maximum mean meeting Mercury meteor meteoritic falls Miss molecules moon motion nebulae night Nininger Notes obsd OCCULTATIONS October orbit particles period photographic planet planetary POPULAR ASTRONOMY position present probably radiation reported result right ascension rotation Saturn September sideritic solar space spectra spectrum SS Cygni stellar stellar magnitude sunspots surface taenite telescope temperature theory tides tion total number University Uranus Variable Star Observers variable stars variation velocity Venus visible visual Yerkes Observatory