Outlines of Astronomy |
From inside the book
Results 1-5 of 100
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 42
... interval , as the night advances , he will not fail to perceive that they have changed their places , and advanced , as by a general movement , in a westward direction ; those towards the eastern quarter appearing to rise or recede from ...
... interval , as the night advances , he will not fail to perceive that they have changed their places , and advanced , as by a general movement , in a westward direction ; those towards the eastern quarter appearing to rise or recede from ...
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 ...
Other editions - View all
Common terms and phrases
amount angle angular appear apsides ascertained astronomical attraction axis bright calculation celestial circle comet described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Julian period 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 phænomena planet planetary pole portion position precession proper motions proportion recede recess refraction remarkable respect result revolution 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 vols whole zenith