Review of Herschel's Outlines of AstronomyMetcalf, printers to the University, 1849 - 29 pàgines |
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Adams's planet aëronaut alluded appeared approximately article by Wurm asserted asteroids Astronomer Royal beautiful beginner Bessel Bode Bode's law chapter clouds comet was seen comets are mentioned computed consider deviations differ diffuse disc discovery of Neptune eccentricity eclipses elementary elements errors EXAMINER FOR SEPTEMBER fact formula geometer given Godfrey Godfrey's claim Halley Halley's Halley's comet HARVARD COLLEGE heat heavens height hyperbolic hypothesis Iapetus illustrious invention Jupiter knowledge known Königsberg labors Le Verrier letter longitude of Uranus mathematicians mean distance Mimas months moon motion nearly north latitude observed orbit of Uranus Outlines of Astronomy Peirce's perhaps perihelion passage period position possible intermediate returns present probably Professor Peirce published quæ rays remark satellites says Pingré semi-axis sextant Sir John Herschel solar system speak star telescope Tethys theory of Neptune tion Titius Treatise true unquestionably Uranus's greatest Verrier and Adams visible Voiron William Herschel
Passatges populars
Pàgina 25 - ... adverse to notions he may have previously formed for himself, or taken up, without examination, on the credit of others. Such an effort is, in fact, a commencement of that intellectual discipline which forms one of the most important ends of all science. It is the first movement of approach towards that state of mental purity which alone can fit us for a full and steady perception of moral beauty as well as physical adaptation. It is the " euphrasy and rue " with which we must " purge our sight...
Pàgina 1 - I trust the number will be few), that its utmost pretension is to place them on the threshold of this particular wing of the temple of Science, or rather on an eminence exterior to it, whence they may obtain something like a general notion of its structure ; or, at most, to give those who may wish to enter a ground-plan of its accesses, and put them in possession of the pass-word.
Pàgina 7 - From the last remark it follows, that the body of the sun, however dark it may appear when seen through its spots, may, nevertheless, be in a state of most intense ignition. It does not, however, follow of necessity that it must be so. The contrary is at least physically possible. A perfectly reflective canopy would effectually defend it from the radiation of the luminous regions above its atmosphere, and no heat would be conducted downwards through a gaseous medium increasing rapidly in density....
Pàgina 1 - Admission to its sanctuary, and to the privileges and feelings of a votary, is only to be gained by one means, — sound and sufficient knowledge of mathematics, the great instrument of all exact inquiry, without which no man can ever make such advances in this or any other of the higher departments of science, as can entitle him to form an independent opinion on any subject of discussion within their range.
Pàgina 19 - ... From that time, though not yet arrived at its perihelion, it decreased with such rapidity that already, on the 29th, it was only 3°, and on November 5th, 2 J° in length. There is every reason to believe that before the perihelion, the tail had altogether disappeared, as, though it continued to be observed at Pulkowa up to the very day of its perihelion passage, no mention whatever is made of any tail being seen.
Pàgina 7 - ... the most intensely ignited solids appear only as black spots on the disc of the sun, when held between it and the eye.
Pàgina 25 - ... supported by careful observation and logical argument, even should it prove of a nature adverse to notions he may have previously formed for himself, or taken up, without examination, on the credit of others. Such an effort is, in fact, a commencement of that intellectual discipline which forms one of the most important ends of all science.
Pàgina 3 - It seems probable, from many indications, that the greatest height at which visible clouds over exist does not exceed ten miles; at which height the density of the air is about an eighth part of what it is at the level of the sea.
Pàgina 14 - ... 421, 245 or 247, 180, 158. Should this view of the subject be the true one, we may expect its return about the end of 1864 or beginning of 1865, in which event it will be observable in the Southern Hemisphere, both before and after its perihelion passage.
Pàgina 22 - Bessel remarked that the motions of Uranus, as he had satisfied himself by careful examination of the recorded observations, could not be accounted for by the perturbations of the known planets ; and that the deviations far exceeded any possible limits of error of observation. In reply to the question, Whether the deviations in question might not be due to the action of an unknown planet? — he stated that he considered it highly probable that such was the case, — being systematic, and such as...