Manual of astronomyLippincott, 1853 - 331 páginas |
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Página xii
... in an ellipse -- Centre of gravity of the system - Perturbations and variations - Masses of the Sun and Planets - Kepler's laws - Bode's law of planetary distances • 137 PART III . PRACTICAL ASTRONOMY . SECT . Definitions • xii CONTENTS .
... in an ellipse -- Centre of gravity of the system - Perturbations and variations - Masses of the Sun and Planets - Kepler's laws - Bode's law of planetary distances • 137 PART III . PRACTICAL ASTRONOMY . SECT . Definitions • xii CONTENTS .
Página 14
... mass . Now , it is contrary to all analogy to suppose that the larger body revolves round the smaller . We see that the moon , the smaller body , circulates round the earth , the larger . Jupiter , Saturn , and Uranus , are the centres ...
... mass . Now , it is contrary to all analogy to suppose that the larger body revolves round the smaller . We see that the moon , the smaller body , circulates round the earth , the larger . Jupiter , Saturn , and Uranus , are the centres ...
Página 20
... mass takes off no more from the earth's rotundity , than particles of dust do from that of a small terrestrial globe . 25. The determination of the size of the earth may appear a problem incapable of solution to those who have not much ...
... mass takes off no more from the earth's rotundity , than particles of dust do from that of a small terrestrial globe . 25. The determination of the size of the earth may appear a problem incapable of solution to those who have not much ...
Página 26
... mass , of equal density throughout , would assume the form of an ellipsoid ( that is , a figure of which every section passing through the poles would be an ellipse ) , whose diameters would be as 230 229. But the earth is not of ...
... mass , of equal density throughout , would assume the form of an ellipsoid ( that is , a figure of which every section passing through the poles would be an ellipse ) , whose diameters would be as 230 229. But the earth is not of ...
Página 32
... mass of the earth ; yet this has been accomplished with wonderful precision , con- sidering the difficulties to be encountered in such an undertaking . Indeed , without knowing this density at least approximately , we should remain ...
... mass of the earth ; yet this has been accomplished with wonderful precision , con- sidering the difficulties to be encountered in such an undertaking . Indeed , without knowing this density at least approximately , we should remain ...
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Términos y frases comunes
achromatic altitude angle appear ascer astronomers atmosphere attraction axis azimuth calculated celestial globe circle collimation comet correct declination density describe determine diameter difference direction disc diurnal double stars earth earth's orbit east ecliptic equal equator equatorial equinoctial error fixed stars force Greenwich heavenly body heavens Herschel horizon hour-angle hour-circle inches inclination inferior planet instrument Jupiter latitude length light longitude Mars mean measured Mercury meridian miles minutes moon moon's motion Nautical Almanac nebula nodes object object-glass observation Observatory parallax pass pendulum perihelion perpendicular planet planetary Plate point of Aries polar distance pole portion position proportion rays refraction revolution revolve round right ascension round the sun satellites Saturn seconds seen shadow shew shewn side sidereal sidereal day space sphere spherical sun's superior planet suppose surface telescope tion transit transit circle Uranus Venus vertical vibration wire
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Página 131 - Milky-way, when exploring that region with his best glasses, he has had fields of view which contained no less than 588 stars, and these were continued for many minutes; so that " in one quarter of an hour's time there passed no less than one hundred and sixteen thousand stars through the field of view of his telescope.
Página 42 - ... posterity; but the record remains, and transfuses all its own exactness into every determination which takes it for a groundwork, giving to inferior instruments — nay, even to temporary contrivances, and to the observations of a few weeks or days — all the precision attained originally at the cost of so much time, labour, and expense.
Página 178 - That the interval between the orbits of any two planets is about twice as great as the inferior interval, and only half the superior one.
Página 11 - ... it is most probably also inhabited, like the rest of the planets, by beings whose organs are adapted to the peculiar circumstances of that vast globe.
Página 1 - And yet, fair bow, no fabling dreams But words of the Most High, Have told why first thy robe of beams Was woven in the sky.
Página 42 - The stars are the landmarks of the universe ; and, amidst the endless and complicated fluctuations of our system, seem placed by its Creator as guides and records, not merely to elevate our minds by the contemplation of what is vast, but to teach us to direct our actions by reference to what is immutable in his works.
Página 180 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Página 42 - ... and in all places, of a delicacy so extreme as to be a test for every instrument yet invented by man, yet equally adapted for the most ordinary purposes; as available for regulating a town clock as for conducting a navy to the Indies ; as effective for mapping down the intricacies of a petty barony as for adjusting the boundaries of Transatlantic empires. When once its place has been thoroughly ascertained and carefully recorded, the brazen circle with which...