Popular Astronomy, Volume 19

Algol amateurs Androm angle appear asteroids Astronomical Aurigae axis bodies bright Camelop Cassiop Centauri Cephei comet computed constellation cosmical dust craters curve Cygni Decl Delphini diameter disc distance Draconis Earth eclipse elements Ephemeris equator force Gemin Goodsell Observatory gravity Greenwich Greenwich Mean gyroscope h d h Halley's comet Harvard College Observatory Herculis horizon July June Jupiter Lacertae latitude Leonis Lick Observatory light Lyrae magnitude mass meteor miles Minima of Variable mirror Monoc Moon motion nebula observations Ophiuchi orbit parallax Pegasi perihelion period Persei photographs planets plates POPULAR ASTRONOMY position Professor refractor revolving rotation Sagittarii satellites Saturn seen Sept shows silver Sirius solar system spectroscopic spectrum stellar Sun's surface Tauri telescope theory tion Variable Stars velocity Venus visible Vulpec Yerkes Observatory