Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 230
... disc of the sun is observed to change . They advance regularly towards its western limb or border , where they disappear , and are replaced by others which enter at the eastern limb , and which , pursuing their respective courses , in ...
... disc of the sun is observed to change . They advance regularly towards its western limb or border , where they disappear , and are replaced by others which enter at the eastern limb , and which , pursuing their respective courses , in ...
Сторінка 231
... disc - but the larger spots being traceable closer to the limb than the smaller . * ) The reduction of such observations , or the con- clusion from them of the element in question , is complicated with the effect of the earth's motion ...
... disc - but the larger spots being traceable closer to the limb than the smaller . * ) The reduction of such observations , or the con- clusion from them of the element in question , is complicated with the effect of the earth's motion ...
Сторінка 233
... disc - but such are for the most part small and insignificant . Frequently they make one or two revolutions , being recognized at their reappearance by their situation with respect to the equator , their configurations inter se , their ...
... disc - but such are for the most part small and insignificant . Frequently they make one or two revolutions , being recognized at their reappearance by their situation with respect to the equator , their configurations inter se , their ...
Сторінка 234
... disc of the sun is seen at once through a telescope magnifying moderately enough to allow it , and with a darkening glass such as to suffer it to be contemplated with perfect comfort , it is very evident that the borders of the disc are ...
... disc of the sun is seen at once through a telescope magnifying moderately enough to allow it , and with a darkening glass such as to suffer it to be contemplated with perfect comfort , it is very evident that the borders of the disc are ...
Сторінка 235
... disc of the sun . Now when this takes place , were there no vaporous atmosphere capable of reflecting any light about the sun , the sky ought to appear totally dark , since ( as will hereafter abundantly appear ) there is not the ...
... disc of the sun . Now when this takes place , were there no vaporous atmosphere capable of reflecting any light about the sun , the sky ought to appear totally dark , since ( as will hereafter abundantly appear ) there is not the ...
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
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 Edition effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe heavens heliocentric horizon inclination 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 perturbations planet planetary pole portion position Post 8vo precession proper motions proportion recede recess reckoned refraction respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole Woodcuts zenith
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Сторінка 674 - A Dictionary of Science, Literature, and Art : Comprising the History, Description, and Scientific Principles of every Branch of Human Knowledge ; with the Derivation and Definition of all the Terms in General Use. Edited by WT BRANDE, FRSL and E.