Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 18
... instance ) a spirit - level , with perfect exactness ; then , if we suppose t direction of this line indefinitely prolonged both ways , XMY , the line so drawn will be at right angles to M and therefore parallel to a my , the tangent to ...
... instance ) a spirit - level , with perfect exactness ; then , if we suppose t direction of this line indefinitely prolonged both ways , XMY , the line so drawn will be at right angles to M and therefore parallel to a my , the tangent to ...
Сторінка 18
... instance ) by a spirit - level , with perfect exactness ; then , if we suppose the direction of this line indefinitely prolonged both ways , as XMY , the line so drawn will be at right angles to Mm , and therefore parallel to a my , the ...
... instance ) by a spirit - level , with perfect exactness ; then , if we suppose the direction of this line indefinitely prolonged both ways , as XMY , the line so drawn will be at right angles to Mm , and therefore parallel to a my , the ...
Сторінка 19
... instance , to sail directly away from our station ; at first , when the distance of the ship is small , a spectator , S , situated at some certain height above the sea , sees the whole of the ship , even to the water line where it rests ...
... instance , to sail directly away from our station ; at first , when the distance of the ship is small , a spectator , S , situated at some certain height above the sea , sees the whole of the ship , even to the water line where it rests ...
Сторінка 34
... instance , which at a 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 ...
... instance , which at a 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 ...
Сторінка 48
... instance , immediately the appearance of rotation shifts also , and the apparent centre about which this illusive circulation is performed is transferred to the new object , which , for the moment , appears to rest . This apparent ...
... instance , immediately the appearance of rotation shifts also , and the apparent centre about which this illusive circulation is performed is transferred to the new object , which , for the moment , appears to rest . This apparent ...
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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.