Outlines of astronomy |
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Page 6
... continually recurring to the sources from which the axioms themselves have been drawn ; viz . examples ; that is to say , by bringing forward and dwelling on simple and familiar instances in which the same principles and the same or ...
... continually recurring to the sources from which the axioms themselves have been drawn ; viz . examples ; that is to say , by bringing forward and dwelling on simple and familiar instances in which the same principles and the same or ...
Page 10
... continual process of rectification and correction - of abandoning one point of view for another higher and better - of temporary and occa- sional reception of even positive and admitted errors for the convenience they afford towards ...
... continual process of rectification and correction - of abandoning one point of view for another higher and better - of temporary and occa- sional reception of even positive and admitted errors for the convenience they afford towards ...
Page 12
... continual change of place , as we view them at dif- ferent hours of the day or night , or at different seasons of the year . The ancients , accordingly , one or two of the more en- lightened of them only excepted , admitted no such ...
... continual change of place , as we view them at dif- ferent hours of the day or night , or at different seasons of the year . The ancients , accordingly , one or two of the more en- lightened of them only excepted , admitted no such ...
Page 25
... continually get above more and more of the air , and so relieve ourselves more and more from the pressure with which it weighs upon us , yet the amount of this additional relief , or the ponderable quantity of air surmounted , would be ...
... continually get above more and more of the air , and so relieve ourselves more and more from the pressure with which it weighs upon us , yet the amount of this additional relief , or the ponderable quantity of air surmounted , would be ...
Page 28
... continually increasing in density , it will continually undergo greater and greater refraction in the same direction ; and thus , instead of pur- suing the straight line S d A , it will describe a curve Sdc ba , continually more and ...
... continually increasing in density , it will continually undergo greater and greater refraction in the same direction ; and thus , instead of pur- suing the straight line S d A , it will describe a curve Sdc ba , continually more and ...
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Common terms and phrases
61 Cygni amount angle angular appear apsides ascertained astronomers attraction axis bright calculation celestial Centauri circle comet Cygni described diameter difference direction disc distance disturbing force Ditto diurnal diurnal motion double stars earth ecliptic effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater heavens hemisphere horizon inclination increase instance interval Julian period Jupiter latitude latter length less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's nearly nebula node normal force nutation object observed orbit Orionis parallax parallel perihelion period perturbations phænomena phænomenon planet planetary pole portion position precisely proper motion proportion reckoned refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar solar apex sphere spherical station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible whole
Popular passages
Page 241 - Aries, Taurus, Gemini, Cancer,, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricornus, Aquarius, Pisces.
Page 294 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 351 - On the other hand, in the regions beneath the dark side, a solar eclipse of fifteen years in duration, under their shadow, must afford (to our ideas) an inhospitable asylum to animated beings, ill compensated by the faint light of the satellites. But we shall do wrong to judge of the fitness or unfitness of their condition from what we see around us, when, perhaps, the very combinations which convey to our minds only images of horror, may be in reality theatres of the most striking and glorious displays...
Page 259 - 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 353 - As to getting correct notions on this subject by drawing circles on paper or, still worse, from those very childish toys called orreries, it is out of the question.
Page 58 - 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 285 - The consequence must be absolute aridity below the vertical sun, constant accretion of hoar frost in the opposite region, and, perhaps, a narrow zone of running water at the borders of the enlightened hemisphere. It is possible, then, that evaporation on the one hand, and condensation on the other, may to a certain extent preserve an equilibrium of temperature, and mitigate the extreme severity of both climates.
Page xxv - ... 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...
Page 353 - Venus a pea, on a circle 284 feet in diameter ; the Earth also a pea, on a circle of 430 feet ; Mars a rather large pin's head, on a circle of 654 feet...