Outlines of astronomy |
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Page 34
... difference of level , accompanied , as it must be , with a difference of den- sity in the aërial strata , must also have , corresponding to it , a certain amount of refraction ; less , indeed , than what would be produced by the whole ...
... difference of level , accompanied , as it must be , with a difference of den- sity in the aërial strata , must also have , corresponding to it , a certain amount of refraction ; less , indeed , than what would be produced by the whole ...
Page 50
... difference of angular position of P , with respect to the invariable direction A B D , when viewed from A and from B , is the difference of the two angles D B P and D A P ; now , D B P being the exterior angle of the triangle A B P , is ...
... difference of angular position of P , with respect to the invariable direction A B D , when viewed from A and from B , is the difference of the two angles D B P and D A P ; now , D B P being the exterior angle of the triangle A B P , is ...
Page 52
... difference of the results , of his change of distance from them arising from his change of place , although that difference may be so small as to produce no change in their general aspect to his unassisted sight . This is one of the ...
... difference of the results , of his change of distance from them arising from his change of place , although that difference may be so small as to produce no change in their general aspect to his unassisted sight . This is one of the ...
Page 57
... difference of their stations on the appearance of the outward universe as seen from each . As an exterior object seen from one would appear to have shifted its place were the spectator suddenly transported to the other , so two ...
... difference of their stations on the appearance of the outward universe as seen from each . As an exterior object seen from one would appear to have shifted its place were the spectator suddenly transported to the other , so two ...
Page 70
... difference from exact parallelism is so small that it may be practically disregarded . * To a spec- tator looking upwards such a system of plumb - lines will ap- pear to converge to his zenith ; downwards , to his nadir . ( 117. ) So ...
... difference from exact parallelism is so small that it may be practically disregarded . * To a spec- tator looking upwards such a system of plumb - lines will ap- pear to converge to his zenith ; downwards , to his nadir . ( 117. ) So ...
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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