Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xi
... instruments and observations in general . Of sidereal and solar time . Of the measurements of time . Clocks , chronome ... instrument . Of the measurement of angular intervals . Methods of increasing the accuracy of reading . The vernier ...
... instruments and observations in general . Of sidereal and solar time . Of the measurements of time . Clocks , chronome ... instrument . Of the measurement of angular intervals . Methods of increasing the accuracy of reading . The vernier ...
Сторінка 20
... instruments . Of course , the more of such knowledge he brings to the perusal , the easier will be his progress , and the ... instrument of all exact inquiry , without which no man can ever make such advances in this or any other of the ...
... instruments . Of course , the more of such knowledge he brings to the perusal , the easier will be his progress , and the ... instrument of all exact inquiry , without which no man can ever make such advances in this or any other of the ...
Сторінка 30
... with perfect exactness ; then , if we suppose the direction of this line indefinitely pro- 14 Opw , to terminate . See these instruments described in Chap . III . 1 longed both ways , as XMY , the line so 30 OUTLINES OF ASTRONOMY .
... with perfect exactness ; then , if we suppose the direction of this line indefinitely pro- 14 Opw , to terminate . See these instruments described in Chap . III . 1 longed both ways , as XMY , the line so 30 OUTLINES OF ASTRONOMY .
Сторінка 35
... instrument which informs us of the weight of air incum- bent on a given horizontal surface , confirms this impression , and affords a direct measure of the rate of diminution of the quantity of air which a given space includes as we ...
... instrument which informs us of the weight of air incum- bent on a given horizontal surface , confirms this impression , and affords a direct measure of the rate of diminution of the quantity of air which a given space includes as we ...
Сторінка 43
... instrument cor- rects our error , without , however , dispelling our illusion . By this we learn , that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a materially less angle , than when ...
... instrument cor- rects our error , without , however , dispelling our illusion . By this we learn , that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a materially less angle , than when ...
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
altitude amount angle angular appear apsides ascertained astronomers 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 effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric horizon inclination increase 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 perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable render respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith