2M 



COSMOS 



Sagittar.us, nebula in, 41. 



Sanscrit names of planets, 93. 



Satellites, general considerations on, 131. 



Saturn, numerical data, ITO ; rings, 171 ; 

 eccentric position, 172. 



Sat'irn's satellites, numerical data, 174. 



Schwabe's observations on the solar 

 spots, 85 ; on the eccentric position of 

 Saturn, 172. 



feJcythien myth of a fall of gold (meteors), 

 221. 



Seas (so called) of the Moon, 151. 



Secondary planets, 131. 



Sheeting e4;ars, upper limits of the height 

 of, unascertained, 217 ; various colors, 

 217 ; magnitudes, 219. 



Siderj BorLonia and Sidera Austriaca, 

 64. 



Sidereal aggregation, theory of, 21. 



Sidereal periods of revolution and axial 

 rotation of the planets, 120. 



Sirius, and other fixed stars, estimates 

 of the distance of, 55. 



Small planots, 160. 



Snow spots in Mars, 160. 



Solar system, ditference between, and the 

 system of double stars, 53 ; its limits in- 

 dicated by the orbits of comets, 57 ; its 

 constituents, 57. 



South, Sir James, nebulae resolved by, 22. 



South polar star, search for a, 29. 



Southern Catalogue of the Herachels, 

 25. 



Southern Cross, planetary nebula in, 33 ; 

 black spot in, 46, 51. 



Southern hemisphere, with fewer nebulse, 

 possesses relatively more clusters of 

 stars than the northern, 29 ; the Magel- 

 lanic Clouds, 15, 45. 



Spiral nebula in Asterion, 42. 



Spots, solar, 72, 86 ; lunar, 149 ; on Mars, 

 160. 



Star catalogues, early, 47 ; the Herschels', 

 25 ; the Northern, 26 ; the Southern, 26. 



Star clusters, 17; predominate in the 

 southern hemisphere, 27. 



Star-formation theory, the, 21 ; inde- 

 pendent of the nebular theory, 21. 



Stellar clusters, probably no essential 

 physical difference between, and nebu- 

 IcB, 23 ; in the northern and the south- 

 ern hemispheres, 27. 



Stemhaufen, star clusters, 17. 



Subel, a vague term of the Arabian astron- 

 omers, 46 



Sun, domain of the, 53 ; its constituents 

 57; translatory motion, 134. 



Sun, considered as the central body, 59 , 

 numerical data, 60 ; conjectures as to 

 its physical character, 61 ; envelopes, 

 62 ; penumbras, 67 ; protuberances, 70. 

 135 ; distribution of solar spots, 72 • 

 chronological list of remarkable ap- 

 pearances of, 74 ; intensity of solar 

 light, 79 ; comparison of artificial light, 

 82 ; rays of light and rays of heat, 83 ; 

 Schwabe's table of occurrence of solar 

 spots, 86. 



Telescope, discoveries of planets since 



the invention of the, 100 ; the Earl of 



Rosse's, 22. 

 Tethys, a satellite of Saturn, 174. 

 Titan, a satellite of Saturn, 174. 

 Titius, on the law of planetary distances, 



116. 

 Transits of Venus, 139. 

 Trapezium of Orion, discovery of new 



stars in, 39. 



Uranus, numerical data, 175. 



Uranus, satellites of, peculiarity of their 

 motion, 176 ; their number undeterm- 

 ined, 177. 



Ursa Major, planetary nebula in, 33. 



Ursa Minor, /3 and y, 29. 



Venus, distance, brilliancy, rotation, trans* 



its, spots, mountains of, 138. 

 Vespucci searches for a south polar star, 



29 ; his mention of the Magellanic 



Clouds, 45. 

 Vesta, discovery of, 100 ; elements, 163. 

 Victoria, discovery of, 101 ; elements, 163. 

 Virgo, nebulous region of, 28. 

 Volcanoes of the Moon, 156. 

 Vulpes, nebula in, 41. 



Week, or seven-day period, early diffused 



among the Semitic nations, 95; the 



Peruvian, an error, 98. 

 White Ox, the large Magellanic Cloud, so 



called by the Arabians, 15, 43. 

 Wilson, on solar spots, 66. 

 Wurm, his correction of Bode's law of 



planetary distance, 118. 



Zodiacal light, early speculations on, 25; 

 later opinions, 202 ; observRtions by 

 the author and others, 203. 



