Outlines of AstronomyLongman, green and Roberts, 1859 - 714 pages |
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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 20
... 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 21
... Suppose A and B to be two eminences , whose perpendicular heights A a and Bb ( which R for simplicity , we will suppose to be exactly C 3 SIZE OF THE EARTH . 21.
... Suppose A and B to be two eminences , whose perpendicular heights A a and Bb ( which R for simplicity , we will suppose to be exactly C 3 SIZE OF THE EARTH . 21.
Page 22
... suppose both the heights and distance of the stations inconsiderable in comparison with the size of the earth , the solution alluded to is contained in the following proposition : - The earth's diameter bears the same proportion to the ...
... suppose both the heights and distance of the stations inconsiderable in comparison with the size of the earth , the solution alluded to is contained in the following proposition : - The earth's diameter bears the same proportion to the ...
Page 28
... Suppose a spectator placed at A , any point of the carth's surface KAk ; and let L , 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 are ...
... Suppose a spectator placed at A , any point of the carth's surface KAk ; and let L , 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 are ...
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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 effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere 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 perturbations phænomena planet planetary pole portion position precession precisely proper motions proportion recede recess reckoned refraction remarkable render respect result revolution revolving right ascension ring 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 whole zenith