Outlines of Astronomy |
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Page xi
... Parallel wire micrometer . Principle of the dupli- cation of images . The heliometer . Double refracting eye - piece . Variable prisin micrometer . Of the position micrometer 76 CHAPTER IV . OF GEOGRAPHY . Of the figure of ( xi )
... Parallel wire micrometer . Principle of the dupli- cation of images . The heliometer . Double refracting eye - piece . Variable prisin micrometer . Of the position micrometer 76 CHAPTER IV . OF GEOGRAPHY . Of the figure of ( xi )
Page 21
... 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 22
... 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 31
... parallel to x my , the tangent to the sphere at m . 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 XN and YQ ; in other ...
... parallel to x my , the tangent to the sphere at m . 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 XN and YQ ; in other ...
Page 43
... 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
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