The Observatory, Bände 46-47

absolute magnitude absorption appear areas Astrographic Astrographic Catalogue Astronomer Royal atmosphere atoms calcium Cape Catalogue centre clouds comet curve density determined diameter disc discussion distance double stars Earth earthquake eclipse Eddington effect Einstein electrons error faculæ faint flocculus galactic geoid give given Greenwich hydrogen lines instrument interest ionized latitude Lick Observatory light limb longitude magnetic mass matter mean measured Meeting meridian meteorological meteors method minor planets Moon motion Mount Wilson Nova novæ observations Observatory obtained orbit Orionids paper parallax period Perseids photographic planets Plaskett plates position present President probably Prof proper motions proper-motions radial velocities radiation region relative right ascensions rotation Royal Astronomical Society shown slide solar spectra spectral type spectroscopic spectrum spiral nebula spots stellar suggested sun-spots Sun's surface telescope temperature theory Turner variable stars variation wave-length