Outlines of astronomy |
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Page 19
... length will become a tangent to the sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the horizon . Mm , which is perpendicular to the general surface of the sphere at m , is also the direction in which ...
... length will become a tangent to the sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the horizon . Mm , which is perpendicular to the general surface of the sphere at m , is also the direction in which ...
Page 22
... length of the arch of the circle between D and b , - viz . half the measured interval , and b B , the excess of its secant above its radius which is the height of B , - data which , by the solution of an easy geometrical problem ...
... length of the arch of the circle between D and b , - viz . half the measured interval , and b B , the excess of its secant above its radius which is the height of B , - data which , by the solution of an easy geometrical problem ...
Page 35
... length remains the same . The dilated size ( generally ) of the sun or moon , when seen near the horizon , beyond what they appear to have when high up in the sky , has nothing to do with refraction . It is an illusion of the judgment ...
... length remains the same . The dilated size ( generally ) of the sun or moon , when seen near the horizon , beyond what they appear to have when high up in the sky , has nothing to do with refraction . It is an illusion of the judgment ...
Page 43
... length , stars which , in their diurnal motion , just graze the horizon at its north point , or only dip below it for a moment ; while others never reach it at all , but continue always above it , revolving in entire circles round ONE ...
... length , stars which , in their diurnal motion , just graze the horizon at its north point , or only dip below it for a moment ; while others never reach it at all , but continue always above it , revolving in entire circles round ONE ...
Page 46
... length reach a line on the earth's surface , called the equator , at any point of which , indifferently , if he take up his station and recommence his observations , he will find that he has both the centres of diurnal motion in his ...
... length reach a line on the earth's surface , called the equator , at any point of which , indifferently , if he take up his station and recommence his observations , he will find that he has both the centres of diurnal motion in his ...
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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 Edition effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Julian period 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 proper motions proportion recede reckoned refraction remarkable respect result revolution revolving right ascension 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 vols whole zenith