Publications of the Astronomical Society of the Pacific, Volumes 57-58

absolute magnitude absorption lines appear Astronomical Society atoms Babylonian bright California Catherine Wolfe Bruce cluster comet comparison stars components coronal lines cycle December diameter director displacements distance dẞd dẞpd eclipse emission lines faint fainter February galactic galaxy Harvard hemisphere hydrogen hydrogen lines infrared intensity interstellar January July June km/sec latitude layer Lick Observatory light-curve luminosity magnetic mathematics maximum measured Medal membrane meteorites meteors methods mirror moon Mount Wilson Observatory nebulae Neugebauer nova observed obtained October orbit Pacific parallax parsecs period photographic planetary planets plates position present problem Professor prominence proper motions radial velocity reflector region rotation San Francisco seen Sept September servatory solar spectra spectrograms spectroscopic spectrum spots stellar sunspot SUNSPOT GROUPS Table telescope theory tion University variable stars visible visual magnitude wave lengths Yerkes Yerkes Observatory