Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 46
... remain constantly invisible to him ; and vice versâ , those stars which at his former station he never saw , he will now never cease to see . ( 66. ) Finally , if , instead of advancing southwards from his first station , he travel ...
... remain constantly invisible to him ; and vice versâ , those stars which at his former station he never saw , he will now never cease to see . ( 66. ) Finally , if , instead of advancing southwards from his first station , he travel ...
Сторінка 78
... remain so , but keeps deviating and shifting . But the most important of this class of errors arise from the non - existence of natural indica- tions , other than those afforded by astronomical observations themselves , whether an ...
... remain so , but keeps deviating and shifting . But the most important of this class of errors arise from the non - existence of natural indica- tions , other than those afforded by astronomical observations themselves , whether an ...
Сторінка 81
... remain unchanged , they are reducible to fixed and ascertainable forms ; each particular defect , whether of structure or adjustment , producing its own ap- propriate form of error . When these are thoroughly inves- tigated , we ...
... remain unchanged , they are reducible to fixed and ascertainable forms ; each particular defect , whether of structure or adjustment , producing its own ap- propriate form of error . When these are thoroughly inves- tigated , we ...
Сторінка 82
... remain so , it becomes a question , what amount of error will arise , in its use , from any assigned deviation , whether in a horizontal or vertical plane , from this precise position . Such inquiries constitute the theory of in ...
... remain so , it becomes a question , what amount of error will arise , in its use , from any assigned deviation , whether in a horizontal or vertical plane , from this precise position . Such inquiries constitute the theory of in ...
Сторінка 99
... remain stationary during the interval while the telescope is shifted on the limb from one object to the other . But the diurnal motion of the heavens , by destroying this essential condition , renders the direct measurement of an- gular ...
... remain stationary during the interval while the telescope is shifted on the limb from one object to the other . But the diurnal motion of the heavens , by destroying this essential condition , renders the direct measurement of an- gular ...
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
angle angular appear apsides ascertained astronomical 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 Edition effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe heavens heliocentric horizon inclination 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 planet planetary pole portion position Post 8vo precession proper motions proportion recede recess reckoned refraction respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole Woodcuts zenith
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Сторінка 674 - A Dictionary of Science, Literature, and Art : Comprising the History, Description, and Scientific Principles of every Branch of Human Knowledge ; with the Derivation and Definition of all the Terms in General Use. Edited by WT BRANDE, FRSL and E.