Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 82
... side too large . And , 2dly , that whatever be the amount of the excentricity , and on whatever part of the circle any proposed angle is measured , the effect of the error in question on the result of observations depending on the ...
... side too large . And , 2dly , that whatever be the amount of the excentricity , and on whatever part of the circle any proposed angle is measured , the effect of the error in question on the result of observations depending on the ...
Сторінка 104
... side be placed upwards the bubble will occupy the higher part , as in the figure ( where the curvature is pur- posely exaggerated ) . Suppose such a tube , as A B , firmly fastened on a straight bar , CD , and marked at a b , two points ...
... side be placed upwards the bubble will occupy the higher part , as in the figure ( where the curvature is pur- posely exaggerated ) . Suppose such a tube , as A B , firmly fastened on a straight bar , CD , and marked at a b , two points ...
Сторінка 105
... side towards which the bubble runs is highest , and must be lowered . Astrono- mical levels are furnished with a divided scale , by which the places of the ends of the bubble can be nicely marked ; and it is said that they can be ...
... side towards which the bubble runs is highest , and must be lowered . Astrono- mical levels are furnished with a divided scale , by which the places of the ends of the bubble can be nicely marked ; and it is said that they can be ...
Сторінка 107
... side to the other of a circle , we are furnished with two quasi - celestial objects , at precisely equal altitudes , on opposite sides of the centre ; and if these be observed in succession with the telescope of the circle , bring- ing ...
... side to the other of a circle , we are furnished with two quasi - celestial objects , at precisely equal altitudes , on opposite sides of the centre ; and if these be observed in succession with the telescope of the circle , bring- ing ...
Сторінка 113
... side of the meridian , its azimuths , whether reckoned both from the north or both from the south point of the horizon , must also be equal , — consequently the north or south point of the horizon must bisect the azimuthal arc thus ...
... side of the meridian , its azimuths , whether reckoned both from the north or both from the south point of the horizon , must also be equal , — consequently the north or south point of the horizon must bisect the azimuthal arc thus ...
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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.