Outlines of AstronomyLongmans, Green, and Company, 1869 - 753 |
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Strona vii
... present state of our knowledge in those departments . The chief novelty in the volume , as it now stands , will be found in the manner in which the subject of Perturbations is treated . It is not it cannot be made elementary , in the ...
... present state of our knowledge in those departments . The chief novelty in the volume , as it now stands , will be found in the manner in which the subject of Perturbations is treated . It is not it cannot be made elementary , in the ...
Strona x
... present the sub- ject in its simplest form , avoiding altogether entering into mi- nutiae of chronological discussion . Collingwood , April 12 , 1849 . J. F. W. HERSCHEL . PREFACE INTRODUCTION ........ CONTENTS . 10000 .......... Page ...
... present the sub- ject in its simplest form , avoiding altogether entering into mi- nutiae of chronological discussion . Collingwood , April 12 , 1849 . J. F. W. HERSCHEL . PREFACE INTRODUCTION ........ CONTENTS . 10000 .......... Page ...
Strona xiv
... present attached to cometary astronomy , and its reasons . Re- marks on cometary orbits in general 295 PART II . OF THE PLANETARY PERTURBATIONS . CHAPTER XII . Subject propounded . Problem of three bodies . Superposition of small ...
... present attached to cometary astronomy , and its reasons . Re- marks on cometary orbits in general 295 PART II . OF THE PLANETARY PERTURBATIONS . CHAPTER XII . Subject propounded . Problem of three bodies . Superposition of small ...
Strona 18
... present only lucid sparks or brilliant atoms , are to him suns of various and transcendent glory - effulgent centres of life and light to myriads of unseen worlds . So that when , after dilating his thoughts to comprehend the grandeur ...
... present only lucid sparks or brilliant atoms , are to him suns of various and transcendent glory - effulgent centres of life and light to myriads of unseen worlds . So that when , after dilating his thoughts to comprehend the grandeur ...
Strona 20
... present work ( though of such , at least in the latter predicament , — I trust the num- ber will be few ) , that its utmost pretension is to place them on the threshold of this particular wing of the temple of Science , or rather on an ...
... present work ( though of such , at least in the latter predicament , — I trust the num- ber will be few ) , that its utmost pretension is to place them on the threshold of this particular wing of the temple of Science , or rather on an ...
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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.