Outlines of astronomy |
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Page xix
... angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural circle . The Meridian circle . Fixation of polar and horizontal points . The level , plumb- line , artificial horizon ...
... angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural circle . The Meridian circle . Fixation of polar and horizontal points . The level , plumb- line , artificial horizon ...
Page 18
... angular diameter . Leaving , at present , out of con- sideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this ...
... angular diameter . Leaving , at present , out of con- sideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this ...
Page 19
... angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more and more the higher we ascend . The figure exhibits three states or ...
... angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more and more the higher we ascend . The figure exhibits three states or ...
Page 31
... angular distance of the object from the zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases to give correct results in the vicinity of the horizon , where the law becomes much more ...
... angular distance of the object from the zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases to give correct results in the vicinity of the horizon , where the law becomes much more ...
Page 49
... angular velocity in pro- portion to their proximity ; the same distance of advance AB subtending a greater angle , A P B = c P p , at the near object P than at the remote one Q. ( 69. ) A consequence of the familiar appearance we have ...
... angular velocity in pro- portion to their proximity ; the same distance of advance AB subtending a greater angle , A P B = c P p , at the near object P than at the remote one Q. ( 69. ) A consequence of the familiar appearance we have ...
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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