Manual of astronomyLippincott, 1853 - 331 páginas |
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Página 10
... direction as the motion of the sun on his axis . Thus , suppose the earth ( fig . 2 ) to be at E when a spot disappears ; if the earth stood still at E , the in- habitants would again see the spot disappear after one a b с Fig . 2 . E D ...
... direction as the motion of the sun on his axis . Thus , suppose the earth ( fig . 2 ) to be at E when a spot disappears ; if the earth stood still at E , the in- habitants would again see the spot disappear after one a b с Fig . 2 . E D ...
Página 15
... direction of the rays of light which proceed from them , the sun appears in consequence of the earth's advance in ... direction of the true position of the sun ; one of its longest sides will be the direction in which he will be seen ...
... direction of the rays of light which proceed from them , the sun appears in consequence of the earth's advance in ... direction of the true position of the sun ; one of its longest sides will be the direction in which he will be seen ...
Página 17
... direction of the zodiac . " The zodiacal light may frequently be seen in this country most advantageously in March and Sep- tember , when the sun is near the equator . 18 SECTION III . ON THE EARTH . THE EARTH THE SUN . 17.
... direction of the zodiac . " The zodiacal light may frequently be seen in this country most advantageously in March and Sep- tember , when the sun is near the equator . 18 SECTION III . ON THE EARTH . THE EARTH THE SUN . 17.
Página 19
... sailing constantly in the same direction , either east or west , would never return to the place from which she started , but continue to increase her distance from it . But navigators constantly are leaving Eng- land THE EARTH . 19.
... sailing constantly in the same direction , either east or west , would never return to the place from which she started , but continue to increase her distance from it . But navigators constantly are leaving Eng- land THE EARTH . 19.
Página 20
... direction , cast a circular shadow ; the earth therefore must be globular . 24. It may be supposed that the rotundity of our earth is rendered irregular by the elevations and de- pressions of the mountains and valleys on its surface ...
... direction , cast a circular shadow ; the earth therefore must be globular . 24. It may be supposed that the rotundity of our earth is rendered irregular by the elevations and de- pressions of the mountains and valleys on its surface ...
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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...