Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xv
... ascertained . Perturbations of Uranus resulting in the discovery of Neptune ......... PART III . OF SIDEREAL ASTRONOMY . CHAPTER XV . 387 / Of the fixed stars . Their classification by magnitudes . Photometric scale of magnitudes ...
... ascertained . Perturbations of Uranus resulting in the discovery of Neptune ......... PART III . OF SIDEREAL ASTRONOMY . CHAPTER XV . 387 / Of the fixed stars . Their classification by magnitudes . Photometric scale of magnitudes ...
Сторінка 19
... ascertained character of the science itself , render this course both practicable and eligible . Practicable , because there is now no danger of any revolution in astronomy , like those which are daily changing the features of the less ...
... ascertained character of the science itself , render this course both practicable and eligible . Practicable , because there is now no danger of any revolution in astronomy , like those which are daily changing the features of the less ...
Сторінка 32
... ascertaining it . Suppose A and B to be two eminences , whose perpendicular heights Aa and Bb ( which , for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measure ...
... ascertaining it . Suppose A and B to be two eminences , whose perpendicular heights Aa and Bb ( which , for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measure ...
Сторінка 33
... ascertaining the dimensions of the earth , yet it will suffice to afford such an approximation to it as shall be of use in the present stage of the reader's knowledge , and help him to many just conceptions , on which account we shall ...
... ascertaining the dimensions of the earth , yet it will suffice to afford such an approximation to it as shall be of use in the present stage of the reader's knowledge , and help him to many just conceptions , on which account we shall ...
Сторінка 35
... ascertaining the existence of any air at all would fail to afford the slightest perceptible indications of its presence . ( 34. ) Laying out of consideration , therefore , at present , all nice ques- tions as to the probable existence ...
... ascertaining the existence of any air at all would fail to afford the slightest perceptible indications of its presence . ( 34. ) Laying out of consideration , therefore , at present , all nice ques- tions as to the probable existence ...
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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