Outlines of astronomy |
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Page 44
... observed setting in the west have again risen in the east , while those which were rising when he first began to notice them have completed their course , and are now set ; and that thus the hemisphere , or a great part of it , which ...
... observed setting in the west have again risen in the east , while those which were rising when he first began to notice them have completed their course , and are now set ; and that thus the hemisphere , or a great part of it , which ...
Page 57
... observations to the other station ; but , as every locality on the globe may be a station of observation , it is far more convenient and natural to fix upon a point equally related to all , as the common point of reference ; and this ...
... observations to the other station ; but , as every locality on the globe may be a station of observation , it is far more convenient and natural to fix upon a point equally related to all , as the common point of reference ; and this ...
Page 74
... 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 ...
Page 79
... observations : others , again , are consequences of imperfect workmanship , as where an instrument once well ... observed , that , in so far as they cannot be reduced to known laws , and thereby become subjects of calculation and ...
... observations : others , again , are consequences of imperfect workmanship , as where an instrument once well ... observed , that , in so far as they cannot be reduced to known laws , and thereby become subjects of calculation and ...
Page 80
... observation to be the ultimate means of de- tection of all mechanical defects which elude by their mi- nuteness every other mode of detection . What the eye cannot discern nor the touch perceive , a course of astronomical observations ...
... observation to be the ultimate means of de- tection of all mechanical defects which elude by their mi- nuteness every other mode of detection . What the eye cannot discern nor the touch perceive , a course of astronomical observations ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical attraction axis bright calculation celestial circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect 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 reckoned 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 vols whole zenith