 | sir John Frederick W. Herschel (1st bart.) - 1833 - 500 páginas
...entry, and that the star has really been observed, and as really has disappeared from the heavens.* This is a branch of practical astronomy which has been too little followed up, and it is precisely that in which amateurs of the science, provided with only good eyes, or moderate... | |
 | Sir John Frederick William Herschel - 1833 - 444 páginas
...entry, and that the star has really been observed, and as really has disappeared from the heavens.* This is a branch of practical astronomy which has been too little followed up, and it is precisely that in which amateurs of the science, provided with only good eyes, or moderate... | |
 | John Farrar - 1834 - 504 páginas
...entry, and that the star lias really been observed, and as really has disappeared from the heavens. This is a branch of practical astronomy which has been too little followed up, and it is precisely that in which amateurs of the science, provided with only good eyes, or moderate... | |
 | John Frederick William Herschel - 1849 - 672 páginas
...been observed, and as really has disappeared from the heavens. The whole subject of variable stars is a branch of practical astronomy which has been too little followed up, and it is precisely that in which amateurs of the science, and especially voyagers at sea, provided... | |
 | Alexis Caswell - 1859 - 33 páginas
...to Sirius in brightness. The whole number of variable stars which have 18 ADDRESS OF THE PRESIDENT been subjected to a more or less careful examination,...good definition and great power of illumination, the nebulae present objects of interest which are hardly second to any others. The results furnished by... | |
 | American Association for the Advancement of Science - 1860 - 460 páginas
...cause of their greatest and least abundance in periods of about eleven years, as discovered by SchwabS, time must determine. Do these spots occasion any sensible...good definition and great power of illumination, the nebulae present objects of interest which are hardly second to any others. The results furnished by... | |
 | American Association for the Advancement of Science - 1860 - 468 páginas
...conditions which determine Algol, in the short space of three and a half hours, to change from a staj of the second, to one of the fourth, magnitude, remain...good definition and great power of illumination, the nebulae present objects of interest which are hardly second to any others. The results furnished by... | |
 | 1851 - 702 páginas
...heat afforded primarily by the sun itself." — P. 527, $ 830. "The whole subject of variable stars is a branch of practical astronomy which has been too little followed up, and it is precisely that in which amateurs of the science, and especially voyagers at sea, provided... | |
 | John R. Percy - 2007 - 330 páginas
...Herschel (1792-1871) said about variable stars in the 1833 edition of his Principles of Astronomy: this is a branch of practical astronomy which has been too little followed up, and it is precisely that in which amateurs of the science, provided with only good eyes, or moderate... | |
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What a boundless field of observation, inquiry, and conjecture, does this subject open before us! — a field scarcely yet entered upon, but one which is, no doubt, destined to yield the richest harvest to the labors of future astronomers. What are the... 