Outlines of Astronomy |
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Page 22
... 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 CD b B , we know Db ...
... 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 CD b B , we know Db ...
Page 40
... 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 ...
Page 41
... 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 ...
Page 47
... 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 ...
Page 53
... interval , viz . a semidiameter of the earth , will yet , on account of the vast distance at which that interval is seen , be confounded together , and undistinguishable from each other in the region of the stars , when viewed by a ...
... interval , viz . a semidiameter of the earth , will yet , on account of the vast distance at which that interval is seen , be confounded together , and undistinguishable from each other in the region of the stars , when viewed by a ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical atmosphere attraction axis bright calculation celestial circle coincidence comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations phænomena phænomenon planet planetary pole portion position precession precisely proper motion proportion recede recess refraction remarkable respect result revolution revolving right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible whole zenith