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action actual advance amount angle angular appear arise ascertained astronomers attraction axis becomes body bright calculation called cause centre circle comet compared complete considerable considered continually corresponding course described determined diameter difference direction distance disturbing earth ecliptic effect elements ellipse epoch equal equator error evident exact excentricity existence fact figure fixed follows 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 represent respect result rotation round seen side sidereal situation solar space sphere stars station successive sun's suppose surface telescope tion true variation visible whole
Strona 211 - ... of those great deposits of dynamical efficiency which are laid up for human use in our coal strata. By them the waters of the sea are made to circulate in vapour through the air, and irrigate the land, producing springs and rivers.
Strona 20 - 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.
Strona 236 - 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.
Strona 211 - 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.
Strona 204 - The part of the sun's disc not occupied by spots is far from uniformly bright. Its ground is finely mottled with an appearance of minute, dark dots, or pores, which, when 'attentively watched, are found to be in a constant state of change. There is nothing which represents so faithfully this appearance as the slow subsidence of some flocculent chemical precipitates in a transparent fluid, when viewed perpendicularly from above...
Strona 64 - 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...
Strona 281 - 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.
Strona 514 - It is not easy for language to convey a full impression of the beauty and sublimity of the spectacle which this nebula offers, as it enters the field of view of a telescope fixed in Right Ascension, by the diurnal motion, ushered in as it is by so glorious and innumerable a procession of stars, to which it forms a sort of climax," and in a part of the heavens otherwise full of interest.
Strona 281 - On such planets giants might exist, and those enormous animals which on earth require the buoyant power of water to counteract their weight, might there be denizens of the land.
Strona 516 - ... inches of reflecting aperture, up to perfectly separated stars like the Milky Way, and clustering groups sufficiently insulated and condensed to come under the designation of irregular, and in some cases pretty rich clusters. But besides those, there are also nebulse in abundance, both regular and irregular ; globular clusters in every state of condensation ; and objects of a nebulous character quite peculiar, and which have no analogue in any other region of the heavens.