Outlines of AstronomyLongmans, Green, and Company, 1869 - 753 |
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Strona vii
... object and general character are sufficiently stated in the introductory chapter of that volume , here reprinted with little alteration ; but an oppor- tunity having been afforded me by the Proprietors , preparatory to its re ...
... object and general character are sufficiently stated in the introductory chapter of that volume , here reprinted with little alteration ; but an oppor- tunity having been afforded me by the Proprietors , preparatory to its re ...
Strona 18
... objects the most familiar may thereby become placed . Almost all its conclusions stand in open and striking ... object to teach as it now stands , than to raise or revive objections against it ; and that , in short , he comes to ...
... objects the most familiar may thereby become placed . Almost all its conclusions stand in open and striking ... object to teach as it now stands , than to raise or revive objections against it ; and that , in short , he comes to ...
Strona 19
... object is not to convince or refute opponents , nor to inquire , under the semblance of an assumed ignorance , for ... objects , or in any way fetter ourselves by a rigid adherence to method . Writing only to be understood , and to ...
... object is not to convince or refute opponents , nor to inquire , under the semblance of an assumed ignorance , for ... objects , or in any way fetter ourselves by a rigid adherence to method . Writing only to be understood , and to ...
Strona 24
... objects to which the intention of the astronomer is directed . The term astronomy ' itself , which denotes the law or ... object of the astronomer's consideration , and indeed , the chief of all . It derives its importance , in 1 Aσrno ...
... objects to which the intention of the astronomer is directed . The term astronomy ' itself , which denotes the law or ... object of the astronomer's consideration , and indeed , the chief of all . It derives its importance , in 1 Aσrno ...
Strona 25
... objects which immediately surround us , be not itself in motion , unperceived by us ; and if so , of what nature that motion is . The apparent places of a number of objects , and their apparent arrangement with respect to each other ...
... objects which immediately surround us , be not itself in motion , unperceived by us ; and if so , of what nature that motion is . The apparent places of a number of objects , and their apparent arrangement with respect to each other ...
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Kluczowe wyrazy i wyrażenia
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 gravity greater heavens heliocentric horizon inclination increase inequality instance instrument interval Jupiter latitude latter length less light longitude lunar magnitude mass mean measure meridian moon moon's motion nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perpendicular perturbations planet planetary pole portion position precession precisely proper motions proportion recede recess reckoned refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith
Popularne fragmenty
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.