Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 21
... interval a Db , by measurement ; then it is clear that D , the visible horizon of both , will lie just half - way between them , and if we sup- pose a Db to be the sphere of the earth , and C its centre in the figure C D b B , we know ...
... interval a Db , by measurement ; then it is clear that D , the visible horizon of both , will lie just half - way between them , and if we sup- pose a Db to be the sphere of the earth , and C its centre in the figure C D b B , we know ...
Сторінка 39
... intervals of time , ad infinitum . ( 55. ) Now , in this we have a lively picture of that grand phenomenon , the ... interval of twenty - four hours is the first in- stance we encounter of that great law of periodicity * , which , as ...
... intervals of time , ad infinitum . ( 55. ) Now , in this we have a lively picture of that grand phenomenon , the ... interval of twenty - four hours is the first in- stance we encounter of that great law of periodicity * , which , as ...
Сторінка 40
... interval of time elapsing between two successive returns of the same star to the same point of the sky ; or , rather , it is demon- strable from astronomical records that no such change has taken place . And with respect to the other ...
... interval of time elapsing between two successive returns of the same star to the same point of the sky ; or , rather , it is demon- strable from astronomical records that no such change has taken place . And with respect to the other ...
Сторінка 46
... interval . In this situation , no part of the heavens is concealed from his successive view . In a night of twelve hours ( supposing such a continuance of darkness pos- sible at the equator ) the whole sphere will have passed in review ...
... interval . In this situation , no part of the heavens is concealed from his successive view . In a night of twelve hours ( supposing such a continuance of darkness pos- sible at the equator ) the whole sphere will have passed in review ...
Сторінка 49
... clear they must be immensely distant . Were it not so , the apparent angular interval between any two of them seen over head would be much greater than E when seen near the horizon , and the constellations , PARALLACTIC MOTION . 49.
... clear they must be immensely distant . Were it not so , the apparent angular interval between any two of them seen over head would be much greater than E when seen near the horizon , and the constellations , PARALLACTIC MOTION . 49.
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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.