Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xii
... diameter also variable . Variation of its distance concluded . Its apparent orbit an ellipse about the focus . Law ... diameter . Its parallax , dis- tance , and real diameter . First approximation to its orbit . the Earth in the focus ...
... diameter also variable . Variation of its distance concluded . Its apparent orbit an ellipse about the focus . Law ... diameter . Its parallax , dis- tance , and real diameter . First approximation to its orbit . the Earth in the focus ...
Сторінка 28
... diameter , measured with an instru- ment called the dip sector , is the same ( except under some singular atmos- pheric circumstances , which produce a temporary distortion of the outline ) , in whatever direction the measure is taken ...
... diameter , measured with an instru- ment called the dip sector , is the same ( except under some singular atmos- pheric circumstances , which produce a temporary distortion of the outline ) , in whatever direction the measure is taken ...
Сторінка 29
... diameter of the visible area , as measured by the dip sec- tor , is materially less than at a lower level ; or , in other words , that the apparent size of the earth has sensibly diminished as we have receded from its surface , while ...
... diameter of the visible area , as measured by the dip sec- tor , is materially less than at a lower level ; or , in other words , that the apparent size of the earth has sensibly diminished as we have receded from its surface , while ...
Сторінка 30
... diameter . Leaving , at present , out of consideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this is the ...
... diameter . Leaving , at present , out of consideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this is the ...
Сторінка 33
... diameter bears the same proportion to the distance of the visible horizon from the eye as that distance does to the height of the eye above the sea level . When the stations are unequal in height , the problem is a little more ...
... diameter bears the same proportion to the distance of the visible horizon from the eye as that distance does to the height of the eye above the sea level . When the stations are unequal in height , the problem is a little more ...
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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