Outlines of Astronomy |
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Page viii
... less for the sake of the theory itself than for the spirit of far - reaching thought , superior to and disencumbered of technical aids , which distinguishes that beyond any other pro- duction of the human intellect . In delivering a ...
... less for the sake of the theory itself than for the spirit of far - reaching thought , superior to and disencumbered of technical aids , which distinguishes that beyond any other pro- duction of the human intellect . In delivering a ...
Page 34
... less than five miles . To esti- mate the proportion of the area visible from this elevation to the whole earth's surface , we must have recourse to the geometry of the sphere , which informs us that the convex surface of a spherical ...
... less than five miles . To esti- mate the proportion of the area visible from this elevation to the whole earth's surface , we must have recourse to the geometry of the sphere , which informs us that the convex surface of a spherical ...
Page 40
... less a quantity than 33 ' , which is rather more than the greatest apparent diameter of either the sun or the moon . Hence it follows , that when we see the lower edge of the sun or moon just apparently resting on the horizon , its ...
... less a quantity than 33 ' , which is rather more than the greatest apparent diameter of either the sun or the moon . Hence it follows , that when we see the lower edge of the sun or moon just apparently resting on the horizon , its ...
Page 41
... less bent in passing through it , the lower most , the higher less , and that which , like SRO , merely grazes the exterior limit of the atmosphere , not at all . Let us consider several points , A , B , C , D , each more remote than ...
... less bent in passing through it , the lower most , the higher less , and that which , like SRO , merely grazes the exterior limit of the atmosphere , not at all . Let us consider several points , A , B , C , D , each more remote than ...
Page 43
... less , indeed , than what would be produced by the whole atmo- sphere , but still often of very appreciable , and even considerable , amount . This refraction between terrestrial stations is termed terrestrial refraction , to ...
... less , indeed , than what would be produced by the whole atmo- sphere , but still often of very appreciable , and even considerable , amount . This refraction between terrestrial stations is termed terrestrial refraction , to ...
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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