Outlines of AstronomyLea & Blanchard, 1849 - 620 pages |
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Page 8
... distance concluded . Its apparent orbit an ellipse about the focus . Law of the angular velocity . Equable description of areas . Parallax of the Sun. Its distance and magnitude . Copernican explanation of the Sun's apparent motion ...
... distance concluded . Its apparent orbit an ellipse about the focus . Law of the angular velocity . Equable description of areas . Parallax of the Sun. Its distance and magnitude . Copernican explanation of the Sun's apparent motion ...
Page 10
... distances and periods . Theory of the Perihelia and excentricities . Geometrical representation of their momentary ... distance . Effect of parallax analogous to that of aberration . How distinguished from it . Detection of parallax by ...
... distances and periods . Theory of the Perihelia and excentricities . Geometrical representation of their momentary ... distance . Effect of parallax analogous to that of aberration . How distinguished from it . Detection of parallax by ...
Page 33
... distance , or from atmospheric indistinctness . It will be worth while to pursue the general notion thus acquired into some of its consequences , by which its consistency with observations of a different kind , and on a larger scale ...
... distance , or from atmospheric indistinctness . It will be worth while to pursue the general notion thus acquired into some of its consequences , by which its consistency with observations of a different kind , and on a larger scale ...
Page 34
... distance , not only does the visible portion still continue to diminish in apparent size , but the hull begins to disappear bodily , as if sunk below the surface . When it has reached a certain distance , as at C , its hull has entirely ...
... distance , not only does the visible portion still continue to diminish in apparent size , but the hull begins to disappear bodily , as if sunk below the surface . When it has reached a certain distance , as at C , its hull has entirely ...
Page 35
... distance of the stations inconsiderable in comparison with the size of the earth , the solu- tion alluded to is contained in the following proposition : - The earth's diameter bears the same proportion to the distance of the visible ...
... distance of the stations inconsiderable in comparison with the size of the earth , the solu- tion alluded to is contained in the following proposition : - The earth's diameter bears the same proportion to the distance of the visible ...
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Common terms and phrases
altitude amount angle angular appear apsides ascertained astronomers axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe greater heavens heliocentric horizon inclination increase inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's motion nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable rendered respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible volume whole zenith
Popular passages
Page 231 - The sun's rays are the ultimate source of almost every motion which takes place on the surface of the earth. By its heat are produced all winds, and those disturbances in the electric equilibrium of the atmosphere which give rise to the phenomena of lightning, and probably also to terrestrial action and the aurora.
Page 70 - Ocean, the first thing which strikes us is, that, the north-east and south-east monsoons, which are found the one on the north and the other on...
Page 543 - This earth ? reciprocal, if land be there, Fields and inhabitants. Her spots thou seest As clouds, and clouds may rain, and rain produce Fruits in her soften'd soil, for some to eat Allotted there ; and other suns, perhaps, With their attendant moons, thou wilt descry, Communicating male and female light, Which two great sexes animate the world, Stored in each orb, perhaps, with some that live...
Page 286 - When we contemplate the constituents of the planetary system from the point of view which this relation affords us, it is no longer mere analogy which strikes us, no longer a general resemblance among them, as individuals independent of each other, and circulating about the sun, each according to its own peculiar nature, and connected with it by its own peculiar tie. The resemblance is now perceived to be a true family likeness ; they are bound up in one chain — interwoven in one web of mutual...
Page 18 - ... 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...
Page 543 - In such instances, the larger star is usually of a ruddy or orange hue, while the smaller one appears blue or green, probably in virtue of that general law of optics, which provides that, when the retina is under the influence of excitement by any bright...
Page 589 - Every year whose number is not divisible by 4 without remainder, consists of 365 days ; every year which is so divisible, but is not divisible by 100, of 366 ; every year divisible by 100, but not by 400, again of 365 ; and every year divisible by 400, again of 366.
Page 86 - ... part of an inch ; a quantity requiring a powerful microscope to be discerned at all. Let any one figure to himself, therefore, the difficulty of placing on the circumference of a metallic circle of such dimensions (supposing the difficulty of its construction surmounted...
Page 350 - The projection of this ray ... to so enormous a length, "in a single day, conveys an impression of the intensity of "the forces acting to produce such a velocity of material "transfer through space, such as no other natural phenom"enon is capable of exciting. It is clear that if we have to deal "here with matter, such as we conceive it (viz. possessing "inertia), at all, it must be under the dominion of forces "incomparably more energetic than gravitation, and quite of "a different nature".