Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 34
... considerable altitude always ap- pears round , assumes , as it approaches the horizon , a flattened or oval outline ; its horizontal diameter being visibly greater than that in a vertical direction . When very near the hori- zon , this ...
... considerable altitude always ap- pears round , assumes , as it approaches the horizon , a flattened or oval outline ; its horizontal diameter being visibly greater than that in a vertical direction . When very near the hori- zon , this ...
Сторінка 41
... considerable time in watching their motions , on the same or on several successive nights , he will perceive that each star appears to describe , as far as its course lies above the horizon , a circle in the sky ; that the circles so ...
... considerable time in watching their motions , on the same or on several successive nights , he will perceive that each star appears to describe , as far as its course lies above the horizon , a circle in the sky ; that the circles so ...
Сторінка 42
... considerably bright star , called the Pole Star , which is easily recognized by the very small circle it describes ; so small , indeed , that , without paying particular attention , and referring its position very nicely to some fixed ...
... considerably bright star , called the Pole Star , which is easily recognized by the very small circle it describes ; so small , indeed , that , without paying particular attention , and referring its position very nicely to some fixed ...
Сторінка 44
... considerable star , through the shaft of a chimney . Venus in our climate , and even Jupiter in the clearer skies of tropical countries , are often visible , without any artificial aid , to the naked eye of one who knows nearly where to ...
... considerable star , through the shaft of a chimney . Venus in our climate , and even Jupiter in the clearer skies of tropical countries , are often visible , without any artificial aid , to the naked eye of one who knows nearly where to ...
Сторінка 49
... considerable change of place . An hour's walk , for instance , produces but a small parallactic change in the re- lative situations of the vast and distant masses which surround Whether we walk round a circle of a hundred yards in ...
... considerable change of place . An hour's walk , for instance , produces but a small parallactic change in the re- lative situations of the vast and distant masses which surround Whether we walk round a circle of a hundred yards in ...
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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.