Sun-spots, 179. and magnetism, 190. birth and decay of, 185. cause of, 194. cyclonic motion in, 182. distribution of, 188. duration of, 181. groups of, 181. periodicity of, 189. proper motion of, 187. size of, 181. spectrum of, 193.
Taurus, or the Bull, 342. quadruple star in, 356.
Telescope, Cassegrainian, 23. equatorial, 19. front-view, 22. Gregorian, 23. Herschelian, 22. Lord Rosse's, 25. Melbourne, 25. Newall, 20. Newtonian, 22. Paris, 26. reflecting, 21. Washington, 20. Vienna, 20.
Uranus, discovery of, 271. name of, 270. orbit of, 269. satellites of, 271.
Ursa Major, or the Great Bear, 330. nebula in, 386.
Venus, apparent size of, 231. atmosphere of, 234. brilliancy of, 232. distance of, 231. elongation of, 231. orbit of, 230. periods of, 232. volume of, 231. transits of, 145, 234.
Year, the, 78. anomalistic, 79. Julian, 80. sidereal, 79. tropical, 79.
Missing or obscured punctuation was corrected.
Typographical errors were silently corrected.