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angle apparent astronomers atmosphere attraction axis bodies called carried cause celestial sphere centre century circle comet consequence continued course dark described determined diameter direction distance earth eclipse effect entirely equal equator exact fact fall figure force give glass greater half heavenly heavens horizon inches Jupiter known latter length less light look Mars mass mean measuring meridian method miles minutes mirror months moon motion move nearly necessary node object observations occur opposite orbit owing parallax pass period planet pole position present probably produced question rays reach reason reflected represented result revolving rise rotation round satellites seems seen shown side solar spectrum sphere star supposed surface telescope theory tion transit turn Venus visible whole
Seite 485 - Their lighter wings. To whom these most adhere, He rules a moment : Chaos umpire sits, And by decision more embroils the fray, By which he reigns : next him, high arbiter, Chance governs all.
Seite 306 - Ethereal temper, massy, large, and round, Behind him cast ; the broad circumference Hung on his shoulders like the moon, whose orb Through optic glass the Tuscan artist views At evening from the top of Fesole Or in Valdarno, to descry new lands, Rivers, or mountains, in her spotty globe.
Seite 154 - Observer' at a salary of 100£ per annum, his duty being 'forthwith to apply himself with the most exact care and diligence to the rectifying the tables of the motions of the heavens and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting the art of navigation.
Seite 485 - Eternal anarchy, amidst the noise Of endless wars, and by confusion stand. For Hot, Cold, Moist, and Dry, four champions fierce, Strive here for mast'ry, and to battle bring Their embryon atoms; they around the flag Of each his faction, in their several clans, Light-armed or heavy, sharp, smooth, swift or slow, Swarm populous...
Seite 75 - 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.
Seite 440 - I know, has hitherto been noticed by no one, and, indeed, cannot be well observed except with large telescopes. In the sword of Orion are three stars quite close together. In 1656, as I chanced to be viewing the middle one of these with the telescope, instead of a single star, twelve showed themselves (a not uncommon circumstance). Three of these almost touched each other, and, with four others, shone through a nebula, so that the space around them seemed far brighter than the rest of the heavens,...
Seite 485 - And time and place are lost ; where eldest Night And Chaos, ancestors of Nature, hold Eternal anarchy, amidst the noise Of endless wars, and by confusion stand : For hot, cold, moist and dry, four champions fierce, Strive here for mastery...
Seite 502 - The principle in question may be readily shown in the following way: if a globular, gaseous mass is condensed to one-half its primitive diameter, the central attraction upon any part of its mass will be increased fourfold, while the surface upon which this attraction is exercised will be reduced to one-fourth. Hence the pressure per unit of surface will be increased sixteen times, while the density will be increased only eight times.
Seite 509 - At the present time we can only say that the nebular hypothesis is indicated by the general tendencies of the laws of nature, that it has not been proved to be inconsistent with any fact, that it is almost a necessary consequence of the only theory by which we can account for the origin and conservation of the sun's heat, but that it rests on the assumption that this conservation is to be explained by the laws of nature as we now see them in operation. Should any one be skeptical as to the sufficiency...
Seite 257 - coming down upon us from the north, would, in thirty seconds after they bad crossed the St. Lawrence, be in the Gulf of Mexico, carrying with them the whole surface of the continent in a mass, not simply of ruin, but of glowing vapor, in which the vapors arising from the dissolution of the materials composing the cities of Boston, New York, and Chicago would be mixed in a single indistinguishable cloud.