Outlines of Astronomy |
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Page 27
... 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 29
... Suppose the earth to be repre- sented by the sphere LHNQ , whose centre is C , and let A , G , M be sta- tions at different elevations above various points of its surface , represented Fig . 1 . Z Ο B EDIA by a , g , m respectively ...
... Suppose the earth to be repre- sented by the sphere LHNQ , whose centre is C , and let A , G , M be sta- tions at different elevations above various points of its surface , represented Fig . 1 . Z Ο B EDIA by a , g , m respectively ...
Page 30
... 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 pro- Opw , to terminate . 14 2 ...
... 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 pro- Opw , to terminate . 14 2 ...
Page 32
... Suppose A and B to be two eminences , whose perpendicular heights Aa and Bb ( which , for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measure- ment ; then it is ...
... Suppose A and B to be two eminences , whose perpendicular heights Aa and Bb ( which , for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measure- ment ; then it is ...
Page 37
... Suppose a spectator placed at A , any point of the earth's surface K Ak ; and let L 1 , 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 1 , 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
altitude amount angle angular appear apsides ascertained astronomers axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater heavens heliocentric 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 perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith