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Contents
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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 |