Page:A short history of astronomy(1898).djvu/32
This page has been validated.
xxiv
Contents
PAGE
brightness as a test of nearness : measurement of brightness : "space-penetrating" power of a telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
332 |
| § 259. | Nebulae and star clusters : Herschel's great catalogues |
336 |
| § 260. | Relation of nebulae to star clusters: the "island universe" theory of nebulae : the "shining fluid" theory : distribution of nebulae |
337 |
| § 261. | Condensation of nebulae into clusters and stars |
339 |
| § 262. | The irresolvability of the Milky Way |
340 |
| § 263. | Double stars : their proposed employment for finding parallax : catalogues : probable connection between members of a pair |
341 |
| § 264. | Discoveries of the revolution of double stars : binary stars : their uselessness for parallax |
343 |
| § 265. | The motion of the sun in space : the various positions suggested for the apex |
344 |
| § 266. | Variable stars : Mira and Algol : catalogues of comparative brightness : method of sequences : variability of α Herculis |
346 |
| § 267. | Herschel's work on the solar system : new satellites : observations of Saturn, Jupiter, Venus, and Mars |
348 |
| § 268. | Observations of the sun : Wilson : theory of the structure of the sun |
350 |
| § 269. | Suggested variability of the sun |
351 |
| § 270. | Other researches |
352 |
| § 271. | Comparison of Herschel with his contemporaries : Schroeter |
352 |
CHAPTER XIII.
The Nineteenth Century, §§ 272-320 |
354-409 |
| § 272. | The three chief divisions of astronomy, observational, gravitational, and descriptive |
354 |
| § 273. | The great growth of descriptive astronomy in the nineteenth century |
355 |
| § 274. | Observational Astronomy. Instrumental advances : the introduction of photography |
357 |
| § 275. | The method of least squares : Legendre and Gauss |
357 |
| § 276. | Other work by Gauss : the Theoria Motus : rediscovery of the minor planet Ceres |
358 |