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action actual advance amount angle angular appear arise ascertained astronomical attraction axis becomes body bright calculation called cause centre circle comet compared complete consequence considerable considered continually corresponding course described determined diameter difference direction distance disturbing earth ecliptic effect elements ellipse equal equator error evident exact exactly excentricity existence fact figure fixed force former give given greater heavens horizon inclination increase instance interval known latitude latter least length less light longitude magnitude mass mean measure meridian minute moon motion nature nearly node object observed opposite orbit parallax parallel passing period planet pole portion position precisely present produced proportion reason referred regarded remain remarkable represented respect rest result rotation round seen side sidereal situation solar space sphere stars station successive sun's suppose surface telescope tion true variation visible whole
Сторінка 224 - Aries, Taurus, Gemini, Cancer,, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricornus, Aquarius, Pisces.
Сторінка 268 - 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.
Сторінка 237 - 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.
Сторінка 59 - 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...
Сторінка 268 - Every particle of matter in the universe attracts every other particle with a force directly proportioned to the mass of the attracting particle, and inversely to the square of the distance between them...
Сторінка 537 - In such cases it is equally impossible not to perceive that we are looking through a sheet of stars nearly of a size, and of no great thickness compared with the distance which separates them from us. Were it otherwise we should be driven to suppose the more distant stars uniformly the larger, so as to compensate by their greater intrinsic brightness for their greater distance, a supposition contrary to all probability.
Сторінка 555 - It appears about twelve times in eleven years, — or, more exactly, in a period of 334 days ; remains at its greatest brightness about a fortnight, being then, on some occasions, equal to a large star of the second magnitude ; decreases during about three months, till it becomes completely invisible...
Сторінка 576 - Uranus and Saturn about the sun; and the correspondence between their calculated and observed places in such very elongated ellipses must be admitted to carry with it proof of the prevalence of the Newtonian law of gravity in their systems, of the very same nature and cogency as that of the calculated and observed places of comets round the central body of our own.
Сторінка 22 - Now, as there is no entire continent, or even any very extensive tract of land, known, whose general elevation above the sea is any thing like half this quantity, it follows, that if we would construct...
Сторінка 259 - What is, moreover, extremely singular in the geology of the moon is, that although nothing having the character of seas can be traced, (for the dusky spots which are commonly called seas, when closely examined, present appearances incompatible with the supposition of deep water,) yet there are large regions perfectly level, and apparently of a decided alluvial character.