Outlines of Astronomy |
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Page xxiii
... Parallel wire micrometer . Principle of the duplication of images . The heliometer . Double refracting eye - piece . Variable prism micrometer . Of the position micrometer . Illumination of wires . Solar telescope and eye - piece ...
... Parallel wire micrometer . Principle of the duplication of images . The heliometer . Double refracting eye - piece . Variable prism micrometer . Of the position micrometer . Illumination of wires . Solar telescope and eye - piece ...
Page 6
... parallels , it is yet not impossible that those who are already well acquainted with our subject , and whose knowledge has been acquired by that confessedly higher practice which is incompatible with the avowed objects of the present ...
... parallels , it is yet not impossible that those who are already well acquainted with our subject , and whose knowledge has been acquired by that confessedly higher practice which is incompatible with the avowed objects of the present ...
Page 7
... parallel , or an illustration drawn from some artificial or natural process , of which he has that direct and individual impression which gives it a reality and associates it with a name , will , in almost every such case , supply in a ...
... parallel , or an illustration drawn from some artificial or natural process , of which he has that direct and individual impression which gives it a reality and associates it with a name , will , in almost every such case , supply in a ...
Page 19
... parallel to a my , the tangent to the sphere at A spectator placed at M will therefore see not only all the vault of the sky above this line , as XZY , but also that portion or zone of it which lies between X N and Y Q ; in other words ...
... parallel to a my , the tangent to the sphere at A spectator placed at M will therefore see not only all the vault of the sky above this line , as XZY , but also that portion or zone of it which lies between X N and Y Q ; in other words ...
Page 35
... parallel directions , so that its apparent 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 ...
... parallel directions , so that its apparent 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 ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical atmosphere attraction axis bright calculation celestial circle coincidence 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 heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations phænomena phænomenon planet planetary pole portion position precession precisely proper motion proportion recede recess 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 whole zenith