Outlines of astronomy |
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Page 15
... suppose it to have made its way through the substance of the earth . It must , therefore , have gone under it , and that not by a mere subterraneous channel ; for if we notice the points where it sets and rises for many successive days ...
... suppose it to have made its way through the substance of the earth . It must , therefore , have gone under it , and that not by a mere subterraneous channel ; for if we notice the points where it sets and rises for many successive days ...
Page 19
... Suppose , then , that at our station M we were to adjust a line ( a wooden ruler for instance ) by a spirit - level , with perfect exactness ; then , if we suppose the direction of this line indefinitely prolonged both ways , as XMY ...
... Suppose , then , that at our station M we were to adjust a line ( a wooden ruler for instance ) by a spirit - level , with perfect exactness ; then , if we suppose the direction of this line indefinitely prolonged both ways , as XMY ...
Page 21
... Suppose A and B to be two eminences , whose perpendicular heights A a and Bỏ ( which for simplicity , we will suppose to be exactly equal C 3 SIZE OF THE EARTH . 21.
... Suppose A and B to be two eminences , whose perpendicular heights A a and Bỏ ( which for simplicity , we will suppose to be exactly equal C 3 SIZE OF THE EARTH . 21.
Page 22
... suppose to be exactly equal ) are known , as well as their exact horizontal 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 ...
... suppose to be exactly equal ) are known , as well as their exact horizontal 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 ...
Page 28
... Suppose a spectator placed at A , any point of the earth's surface K Ak ; and let L 7 , M m , N n , represent the successive strata or layers , of decreasing density , into which we may conceive the atmosphere to be divided , and which ...
... Suppose a spectator placed at A , any point of the earth's surface K Ak ; and let L 7 , M m , N n , represent the successive strata or layers , of decreasing density , into which we may conceive the atmosphere to be divided , and which ...
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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