Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 18
... less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more and more the higher ...
... less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more and more the higher ...
Сторінка 23
... less than five miles . To estimate the proportion of the area visible from this elevation to the whole earth's surface , we must have recourse to the geometry of the sphere , which informs us that the convex surface of a spherical ...
... less than five miles . To estimate the proportion of the area visible from this elevation to the whole earth's surface , we must have recourse to the geometry of the sphere , which informs us that the convex surface of a spherical ...
Сторінка 30
... less a quantity than 33 ' , which is rather more than the greatest apparent diameter of either the sun or the moon . Hence it follows , that when we see the lower edge of the sun or moon just apparently resting on the horizon , its ...
... less a quantity than 33 ' , which is rather more than the greatest apparent diameter of either the sun or the moon . Hence it follows , that when we see the lower edge of the sun or moon just apparently resting on the horizon , its ...
Сторінка 32
John Frederick William Herschel. finally at the points P Q R , after being more or less bent in passing through it , the lower most , the higher less , and that which , like SR O , merely grazes the exterior limit of the atmosphere , not ...
John Frederick William Herschel. finally at the points P Q R , after being more or less bent in passing through it , the lower most , the higher less , and that which , like SR O , merely grazes the exterior limit of the atmosphere , not ...
Сторінка 34
... same , and the moon a materially less angle , than when seen at a great alti- tude in the sky , owing to its greater distance from us in the former situation as compared with the latter , as will 34 OUTLINES OF ASTRONOMY .
... same , and the moon a materially less angle , than when seen at a great alti- tude in the sky , owing to its greater distance from us in the former situation as compared with the latter , as will 34 OUTLINES OF ASTRONOMY .
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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.