The System of the Stars

61 Cygni 70 Ophiuchi absorption Algol Andromeda Andromeda nebula appear Arcturus Argûs Astr astronomy atmospheric binary blue bodies bright lines brilliant Canes Venatici Cape Observations Cassiopeia Catalogue centre century cluster colour comets components condensation Crown 8vo dark distance double stars earth effect faint galactic gaseous globular clusters heavens Heliometer hence Hercules Huggins hydrogen hydrogen lines Ibid interval Lalande less light luminous Lyræ magnitude star mass measures ment Meridian circle Milky Monthly Notices movement nearly nebula nebulosity objects Observatory Ophiuchi Ophiuchus orbit Orion Orion nebula pair parallax period Phil photographic photosphere planetary plates Pleiades present Professor proper motion rays red stars refractor remarkable remote Schjellerup seems sidereal Sir John Herschel Sirian Sirius small stars solar southern space spectra spectroscopic spectrum spiral stellar Struve sun's telescope tion Trans variable variable stars velocity visible Wolf-Rayet type yellow