Popular Astronomy, Volume 54

AAVSO aerolite American appeared asteroids Astronomical Society atmosphere average brighter brightness California catalog cell color comet computed constant coördinate number corona Crater curve cycle determined diameter distance earth eclipse effective wave length energy ephemeris equation error exposure fall field filter galvanometer Harvard Harvard College Observatory instruments intensity Jupiter Kepler latitude light longitude lunar magnitude scale maximum means measurements meeting meteorites Meteoritic Falls meteors method moon motion Mount Wilson nebulae North Polar Sequence Nova objective observations Observatory obtained OCCULTATIONS VISIBLE orbit period photoelectric photographic photographic magnitudes photometer photometry Pickering planets plate Polar Sequence present prism Professor Puente-Ladron radiation region reported satellites Saturn September siderites solar spectral spectrophotometry spectrum standard Stebbins stellar sun-spot sunspot surface Table telescope tion U. S. Naval Observatory University Variable Star Venus visual visual magnitude Yerkes Observatory