Outlines of Astronomy |
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Page 50
... observe , that the apparent relative situations of all the stars among one another , is not changed by their diurnal motion . In whatever parts of their circles they are observed , or at whatever hour of the night , they form with each ...
... observe , that the apparent relative situations of all the stars among one another , is not changed by their diurnal motion . In whatever parts of their circles they are observed , or at whatever hour of the night , they form with each ...
Page 52
... observed to sink below it and set ; at first remaining hid only for a very short time , but gradually for a longer ... observations , he will find that he has both the centres of diurnal motion in his horizon , occupying opposite points ...
... observed to sink below it and set ; at first remaining hid only for a very short time , but gradually for a longer ... observations , he will find that he has both the centres of diurnal motion in his horizon , occupying opposite points ...
Page 53
... observe the northern pole of the heavens to become more elevated above his horizon , and the southern more depressed ... observed and recorded by travellers and voyagers . It is , however , in complete accordance with the hypothesis of a ...
... observe the northern pole of the heavens to become more elevated above his horizon , and the southern more depressed ... observed and recorded by travellers and voyagers . It is , however , in complete accordance with the hypothesis of a ...
Page 60
... observation common to all the world , to which each observer , wherever situated , may refer ( or , as it is called , reduce ) his observations , by calcu- lating and allowing for the effect of his local position with respect to that ...
... observation common to all the world , to which each observer , wherever situated , may refer ( or , as it is called , reduce ) his observations , by calcu- lating and allowing for the effect of his local position with respect to that ...
Page 75
... observations in sidereal time . The hour angles corresponding to equal altitudes of a fixed star being equal , the hour angle east or west will be measured by half the observed interval of the observations . In our triangle , then , we ...
... observations in sidereal time . The hour angles corresponding to equal altitudes of a fixed star being equal , the hour angle east or west will be measured by half the observed interval of the observations . In our triangle , then , we ...
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Common terms and phrases
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 ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater 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 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