The Observatory, Svazky 42–43

appears April Astronomer Royal atmosphere bands bright bright bands Carte du Ciel catalogue centre Cepheid variables comet Crommelin Cygni density determined diameter disc displacement distance double stars Earth eclipse Eddington effect Einstein error galactic GENTLEMEN giant stars give given globular clusters gravitation Greenwich helium hydrogen hydrogen lines hypothesis instrument interest July June Jupiter km./sec latitude light limb lines longitude magnetic magnitude maximum mean measured meeting meteorological meteors method miles Moon motion nebula Nova Aquila novæ observations Observatory obtained orbit paper parallax perihelion period Persei photographs planetary planets plates position possible present President probably Prof proper motions proper-motions radial velocities radiation reference rotation satellites solar spectra spectral type spectroscopic spectrum spiral stellar suggested sun-spots Sun's telescope temperature theory tion variable stars velocity wave-length