Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 14
... 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 16
... Suppose the earth to be represented by the sphere LHNQ , whose centre is C , and let A , G , M be stations at different elevations above various points of its surface , represented by a , g , m respectively . From each of them ( as from ...
... Suppose the earth to be represented by the sphere LHNQ , whose centre is C , and let A , G , M be stations at different elevations above various points of its surface , represented by a , g , m respectively . From each of them ( as from ...
Page 18
... 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 X MY ...
... 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 X MY ...
Page 19
... Suppose a ship , for instance , to sail directly away from our station ; - at first , when the distance of the ship is small , a spectator , S , situated at some certain height above the sea , sees the whole of the ship , even to the ...
... Suppose a ship , for instance , to sail directly away from our station ; - at first , when the distance of the ship is small , a spectator , S , situated at some certain height above the sea , sees the whole of the ship , even to the ...
Page 20
... Suppose A and B to be two eminences , whose perpendicular heights A a and Bb ( which B for simplicity , we will suppose to be exactly 20 OUTLINES OF ASTRONOMY .
... Suppose A and B to be two eminences , whose perpendicular heights A a and Bb ( which B for simplicity , we will suppose to be exactly 20 OUTLINES OF ASTRONOMY .
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical axis bright calculation celestial centre circle comet curve degree described diameter difference direction disc distance disturbing body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe heavens heliocentric horizon inclination increase inequality instance interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's motion nearly nebula node normal force nutation object observed orbit parallax perigee perihelion period perturbations planet planetary pole portion position Post 8vo precession proper motion proportion recede recess refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole Woodcuts zenith