Cosmos: A Sketch of a Physical Description of the Universe, Nide 3

61 Cygni according Almagest Annuaire appear Arago Aratus Arcturus Argelander Argûs Aristot Astr Astron astronomers atmosphere Bessel brightness Cape Cassiopeia catalogue celestial century Ceti color comets Compare conjecture constellations cosmical bodies Cosmos Cygni d'une Decl determined diameter disk distance double stars earth epoch ether étoiles fainter fixed stars heliometer hemisphere Hipparchus Hist instruments intensity of light Jacques Cassini Jupiter Kepler l'image l'œil lumière luminous lunette Lyræ Mädler ment Milky moon Nachr naked eye nature nebula number of stars object-glass observed Ophiuchus optical orbit Orionis parallax period phenomena Philos photometric physical planetary planets polar portion proper motion Ptolemy quæ rayons rays reference refraction regions of space remarkable result satellites Schumacher's scintillation seen seventh magnitude Sir John Herschel Sirius sixth magnitude solar system southern sphere stellar strata Struve surface telescope tion Tobias Mayer Tycho Brahe Ursæ variable stars vault of heaven velocity visible William Herschel