Popular Astronomy, Volume 48

altitude amateur appears asteroids Astronomical Society atmosphere average bands bright camera Cepheid College color comet conjunction constellation coördinates December diameter distance earth eclipse Ephemeris equator fall FIGURE Galaxy Harvard Harvard College Observatory inches instruments interest interval January July June Jupiter latitude light curve longitude lunar magnitude Mars mass maximum McMath-Hulbert Observatory mean Mercury meteor meteorites miles moon motion nebulae Notes Nova object observations Observatory OCCULTATIONS October orbit parallax parsecs period Perseids phenomena photographs planetary planets POPULAR ASTRONOMY position precessional action present Professor radiant recorded reflector refractor region reports right ascension rotation Saturn Schmidt Camera shadow shadow bands solar spots SS Cygni stellar stellar magnitude sun's sunspots surface Table tektites telescope theory tion Tungus University Uranus Variable Star velocity Venus visible waves Wilson