The Observatory, Volumes 50-51

absolute magnitude appears Astronomer Royal Astronomical Society atmosphere atoms bright BRITISH ASTRONOMICAL ASSOCIATION calculated catalogue centre Cepheids chromosphere clock colour comet computed corona Crommelin D.Sc Decl deduced density determined diameter discussion distance double stars Earth eclipse Eddington effect electrons ephemeris equation equatorial field galactic geoid give given Greenwich Hipparchus indicate instrument intensity interesting June Jupiter Küstner latitude layer Lick Observatory light limb lines longitude magnetic mean measured Meeting meridian meteors method Moon nebula observations Observatory obtained orbit paper parallax perihelion period Perseids photographs photospheric planet plates present President prime meridian Prof prominences proper motions Quadrantids quantum numbers radiation recent refractor remarked rotation seems slide solar spectra spectral type spectrum spiral spots stars Steavenson stellar storms suggested sun-spots Sun's telescope temperature theory variable variable stars variation velocity wave-lengths