Outlines of Astronomy |
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Page 20
... acknowledged axioms , but by continually recurring to the sources from which the axioms themselves have been drawn ; viz . examples ; that is to : say , by bringing forward and dwelling on simple 20 OUTLINES OF ASTRONOMY .
... acknowledged axioms , but by continually recurring to the sources from which the axioms themselves have been drawn ; viz . examples ; that is to : say , by bringing forward and dwelling on simple 20 OUTLINES OF ASTRONOMY .
Page 35
... continually get above more and more of the air , and so relieve ourselves more and more from the pressure with which it weighs upon us , yet the amount of this additional relief , or the ponderable quan- tity of air surmounted , would ...
... continually get above more and more of the air , and so relieve ourselves more and more from the pressure with which it weighs upon us , yet the amount of this additional relief , or the ponderable quan- tity of air surmounted , would ...
Page 37
... continually increasing in density , it will continually undergo greater and greater refraction in the same direction ; and thus , instead of pursuing the straight line S d A , it will describe a curve S d c b a , continually more and ...
... continually increasing in density , it will continually undergo greater and greater refraction in the same direction ; and thus , instead of pursuing the straight line S d A , it will describe a curve S d c b a , continually more and ...
Page 47
... continual reproduction of the same phenomena , in the same order , at equal intervals of time . ( 56. ) A free rotation of the earth round its centre , if it exist and be performed in consonance with the same mechanical laws which ...
... continual reproduction of the same phenomena , in the same order , at equal intervals of time . ( 56. ) A free rotation of the earth round its centre , if it exist and be performed in consonance with the same mechanical laws which ...
Page 52
... continually less and less inclined to the horizon ; and by the same degrees as the northern pole is depressed the southern will rise , and constellations surrounding it will come into view ; at first momentarily , but by degrees for ...
... continually less and less inclined to the horizon ; and by the same degrees as the northern pole is depressed the southern will rise , and constellations surrounding it will come into view ; at first momentarily , but by degrees for ...
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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