Outlines of Astronomy |
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Page xi
... Appear- ances resulting from diurnal motion . From change of station in general . Parallactic motions . Terrestrial parallax . That of the stars insensible . First step towards forming an idea of the distance of the stars . Copernican ...
... Appear- ances resulting from diurnal motion . From change of station in general . Parallactic motions . Terrestrial parallax . That of the stars insensible . First step towards forming an idea of the distance of the stars . Copernican ...
Page 17
... appear to be supported by careful observation and logical argument , even should it prove of a nature adverse to notions he may have previously formed for himself , or taken up , without examina- tion , on the credit of others . Such an ...
... appear to be supported by careful observation and logical argument , even should it prove of a nature adverse to notions he may have previously formed for himself , or taken up , without examina- tion , on the credit of others . Such an ...
Page 18
... appears to every one , until he has understood and weighed the proofs to the con- trary , the most positive evidence of ... appear only as stars somewhat brighter than the rest , are to him spacious , elabo- rate , and habitable worlds ...
... appears to every one , until he has understood and weighed the proofs to the con- trary , the most positive evidence of ... appear only as stars somewhat brighter than the rest , are to him spacious , elabo- rate , and habitable worlds ...
Page 38
... appear more elevated above the horizon A H , when seen through the refracting atmosphere , than it would appear were there no such atmosphere . Since , however , the disposition of the strata is the same in all directions around A , the ...
... appear more elevated above the horizon A H , when seen through the refracting atmosphere , than it would appear were there no such atmosphere . Since , however , the disposition of the strata is the same in all directions around A , the ...
Page 40
... appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule ...
... appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule ...
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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