Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xiii
... greater . General description of a comet . Comets without tails , or with more than one . Their extreme tenuity . Their probable structure . Motions conformable to the law of gravity . Actual dimensions of comets . Periodical return of ...
... greater . General description of a comet . Comets without tails , or with more than one . Their extreme tenuity . Their probable structure . Motions conformable to the law of gravity . Actual dimensions of comets . Periodical return of ...
Сторінка xvi
... greater of them . The zodiacal light . Shooting stars ............ .............................. 498 PART IV . OF THE ACCOUNT OF TIME . CHAPTER XVIII . Natural units of time . Relation of the sidereal to the solar day affected by ...
... greater of them . The zodiacal light . Shooting stars ............ .............................. 498 PART IV . OF THE ACCOUNT OF TIME . CHAPTER XVIII . Natural units of time . Relation of the sidereal to the solar day affected by ...
Сторінка 36
... greater part of the whole mass , the density diminishing with extreme rapidity as we recede upwards , till , within a very moderate distance ( such as would be represented by the sixth of an inch on the model we have before spoken of ...
... greater part of the whole mass , the density diminishing with extreme rapidity as we recede upwards , till , within a very moderate distance ( such as would be represented by the sixth of an inch on the model we have before spoken of ...
Сторінка 37
... greater and greater refraction in the same direction ; and thus , instead of pursuing the straight line S d A , it will describe a curve S d c ba , continually more and more concave downwards , and will reach the earth , not at A , but ...
... greater and greater refraction in the same direction ; and thus , instead of pursuing the straight line S d A , it will describe a curve S d c ba , continually more and more concave downwards , and will reach the earth , not at A , but ...
Сторінка 40
... greater than its mean amount ; when lower , less ; and , 6thly . That in one and the same state of the barometer the refrac- tion is greater , the colder the air . The variation , owing to these two causes , from its mean amount ( at ...
... greater than its mean amount ; when lower , less ; and , 6thly . That in one and the same state of the barometer the refrac- tion is greater , the colder the air . The variation , owing to these two causes , from its mean amount ( at ...
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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 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 heavens heliocentric horizon inclination increase inequality instance instrument interval Jupiter latitude latter 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 proper motions proportion recede recess reckoned refraction remarkable render 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