Outlines of AstronomyLongman, green and Roberts, 1859 - 714 pages |
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Page 31
... mean state , the amount of refraction is greater than its mean amount ; when lower , less : and , 6thly . That for one and the same reading of the barometer the refraction is greater , the colder the air . The variations , owing to ...
... mean state , the amount of refraction is greater than its mean amount ; when lower , less : and , 6thly . That for one and the same reading of the barometer the refraction is greater , the colder the air . The variations , owing to ...
Page 36
... means of judging of their distances from him , would refer them , in the direc- tions in which they were seen from his station , to the con- cave surface of an imaginary sphere , having his eye for a centre , and its surface at some ...
... means of judging of their distances from him , would refer them , in the direc- tions in which they were seen from his station , to the con- cave surface of an imaginary sphere , having his eye for a centre , and its surface at some ...
Page 80
... mean or average of the results obtained , this class of errors may be so far subdued , by setting them to destroy ... means of de- tection of all mechanical defects which elude by their mi- nuteness every other mode of detection . What ...
... mean or average of the results obtained , this class of errors may be so far subdued , by setting them to destroy ... means of de- tection of all mechanical defects which elude by their mi- nuteness every other mode of detection . What ...
Page 83
... mean , which is one of the chief modes by which precision is attained in practical astronomy . Suppose , for example , the principle of an instrument required that a circle should be concentric with the axis on which it is made to turn ...
... mean , which is one of the chief modes by which precision is attained in practical astronomy . Suppose , for example , the principle of an instrument required that a circle should be concentric with the axis on which it is made to turn ...
Page 87
... mean length of the solar day to the mean or average height of water in a harbour , or the general level of the sea unagitated by tide or waves . The great annual fluctuation above noticed may be compared to the daily vari- ations of ...
... mean length of the solar day to the mean or average height of water in a harbour , or the general level of the sea unagitated by tide or waves . The great annual fluctuation above noticed may be compared to the daily vari- ations of ...
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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 effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere 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 perturbations phænomena planet planetary pole portion position precession precisely proper motions proportion recede recess reckoned refraction remarkable render respect result revolution revolving right ascension ring 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