Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 84
... sun , we observe the moon , we find a third , much longer than either , a lunar day , whose average duration is 24h 54m of our ordinary time , which last is solar time , being of necessity conformable to the sun's successive re ...
... sun , we observe the moon , we find a third , much longer than either , a lunar day , whose average duration is 24h 54m of our ordinary time , which last is solar time , being of necessity conformable to the sun's successive re ...
Сторінка 85
... sun , he must shade his eye with a dark - coloured or smoked glass , and notice the moments when its western and eastern ... sun's apparent motion is not only not the * This is an excellent practical method of ascertaining the rate of a ...
... sun , he must shade his eye with a dark - coloured or smoked glass , and notice the moments when its western and eastern ... sun's apparent motion is not only not the * This is an excellent practical method of ascertaining the rate of a ...
Сторінка 86
... sun's diurnal motion , we bring into view others continually smaller and smaller , which were before obscured , or mixed up with errors of observation and instrumental imperfections . In short , we may not inaptly compare the mean ...
... sun's diurnal motion , we bring into view others continually smaller and smaller , which were before obscured , or mixed up with errors of observation and instrumental imperfections . In short , we may not inaptly compare the mean ...
Сторінка 146
... sun's rays , by which it is unequally heated in different latitudes ; and , 2dly , from that general law in the ... sun is constantly vertical over some one or other part of the earth between two parallels of latitude , called the ...
... sun's rays , by which it is unequally heated in different latitudes ; and , 2dly , from that general law in the ... sun is constantly vertical over some one or other part of the earth between two parallels of latitude , called the ...
Сторінка 154
... sun's motion among the stars . Of the latter , or local reckoning , we have instances in every sidereal clock in an ... sun is on the meridian of that particular place to which it belongs ; and , therefore , in like manner , when we date ...
... sun's motion among the stars . Of the latter , or local reckoning , we have instances in every sidereal clock in an ... sun is on the meridian of that particular place to which it belongs ; and , therefore , in like manner , when we date ...
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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.