Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 217
... perihelion of its orbit ; M the farthest , or the aphelion ; and therefore ASM the aris of the ellipse . Now , suppose the orbit divided into two segments by a straight line PSQ , drawn through the sun , and anyhow situated as to ...
... perihelion of its orbit ; M the farthest , or the aphelion ; and therefore ASM the aris of the ellipse . Now , suppose the orbit divided into two segments by a straight line PSQ , drawn through the sun , and anyhow situated as to ...
Сторінка 218
... perihelion of the orbit is situated nearly at the place of the northern winter solstice ; so that , were it not for the compensation we have just described , the effect would be to exaggerate the difference of summer and winter in the ...
... perihelion of the orbit is situated nearly at the place of the northern winter solstice ; so that , were it not for the compensation we have just described , the effect would be to exaggerate the difference of summer and winter in the ...
Сторінка 221
... perihelion , in the year 1800 was 99 ° 30 ′ 5 ′ we say in the year 1800 , because , in point of fact , by the operation of causes hereafter to be explained , its position is subject to an extremely slow variation of about 12 " per annum ...
... perihelion , in the year 1800 was 99 ° 30 ′ 5 ′ we say in the year 1800 , because , in point of fact , by the operation of causes hereafter to be explained , its position is subject to an extremely slow variation of about 12 " per annum ...
Сторінка 222
... perihelion , then will the angle ASP at first increase more rapidly than the mean longitude , and will , therefore , during the whole semi - revolution from A to M , exceed it in amount ; or , in other words , the true place will be in ...
... perihelion , then will the angle ASP at first increase more rapidly than the mean longitude , and will , therefore , during the whole semi - revolution from A to M , exceed it in amount ; or , in other words , the true place will be in ...
Сторінка 226
... perihelion , has completed one sidereal period , the perihelion will have moved forward by 11 " -8 , which arc must be described by the earth before it can again reach the perihelion . In so doing , it occupies 4m 395.7 and this must ...
... perihelion , has completed one sidereal period , the perihelion will have moved forward by 11 " -8 , which arc must be described by the earth before it can again reach the perihelion . In so doing , it occupies 4m 395.7 and this must ...
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
altitude amount angle angular appear apsides ascertained astronomical 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 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 sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith
Популярні уривки
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.