The Elements of Astronomy: For Colleges, Schools, and Private Students : Written for the Mathematical Course of Joseph RayWilson, Hinkle & Company, 1869 - 336 páginas |
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Página 21
... hence have always the same posi- tion relative to the plane of vibration . Between the equator and the pole , the merid- ians converge , or , what amounts to the same , the new positions which each meridian takes as the earth rotates ...
... hence have always the same posi- tion relative to the plane of vibration . Between the equator and the pole , the merid- ians converge , or , what amounts to the same , the new positions which each meridian takes as the earth rotates ...
Página 22
... Hence , as the pendulum maintains its position , although it may have been started Fig . 11 . in the plane of one of these meridians , an an- gle is soon formed be- tween them which con- stantly increases until they again coincide after ...
... Hence , as the pendulum maintains its position , although it may have been started Fig . 11 . in the plane of one of these meridians , an an- gle is soon formed be- tween them which con- stantly increases until they again coincide after ...
Página 26
... Hence , the latitude of a place is found by finding the altitude of the nearest pole . - 40. The length of a degree of latitude . We shall have gone one degree to the north whenever we shall have in- creased the altitude of the north ...
... Hence , the latitude of a place is found by finding the altitude of the nearest pole . - 40. The length of a degree of latitude . We shall have gone one degree to the north whenever we shall have in- creased the altitude of the north ...
Página 32
... Hence , the points where the sun in his annual motion MERIDIAN Fig . 16 . NORTH POLE OF SKY . AUTUMNAL EQUINOX COLURE WINTER SOLSTICE EQUINOCTIAL 23 ° 27'30 " ECLIPTIC VERNAL EQUINOX EQUINOCTIAL SOLSTITIAL COLURE SUMMER SOLSTICE SOUTH ...
... Hence , the points where the sun in his annual motion MERIDIAN Fig . 16 . NORTH POLE OF SKY . AUTUMNAL EQUINOX COLURE WINTER SOLSTICE EQUINOCTIAL 23 ° 27'30 " ECLIPTIC VERNAL EQUINOX EQUINOCTIAL SOLSTITIAL COLURE SUMMER SOLSTICE SOUTH ...
Página 38
... Hence we may magnify an object so much , and make its light so feeble , that its form can not be distinctly seen ; it fades away as in the twilight . If we would use a higher magnifying power we must find some way to increase the light ...
... Hence we may magnify an object so much , and make its light so feeble , that its form can not be distinctly seen ; it fades away as in the twilight . If we would use a higher magnifying power we must find some way to increase the light ...
Términos y frases comunes
2d mag Alpha Centauri altitude angle appears Arcturus astronomical attraction axis body bright stars brightest called Capricornus cause celestial clock comet conjunction constellation culmination curve daily motion dark declination density diameter distance earth earth's orbit east eccentricity ecliptic equal equator equatorial equinoctial farther fixed stars heat Hence Herschel horizon Jupiter latitude length libration light longitude lunar lunar eclipses Mars mass mean solar measured Mercury meridian meteors millions of miles moon moon's move nearly nebula node observer Ophiuchus opposite parallax particles passes path penumbra perihelion photosphere planet polariscope pole position prime vertical radius rays refraction revolution revolve right ascension ring rotation satellites Saturn seen shadow shows side sidereal sidereal day solar day solar eclipse solar system solstice space spots supposed surface tail telescope tide tion transit triangle Uranus velocity Venus vernal equinox vertical visible zenith
Pasajes populares
Página 143 - The MASS of a body is the quantity of matter which it contains.
Página 237 - Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half in diameter. As to getting correct notions on this subject by drawing circles on paper, or, still worse, from those very childish toys called orreries, it is out of the question.
Página 237 - Mercury will be represented by a grain of mustard seed, on the circumference of a circle 1 64 feet in diameter for its orbit; Venus a pea, on a circle 284 feet in diameter ; the Earth also a pea, on a circle of 430 feet; Mars a rather large pin's head, on a circle of 654 feet...
Página 126 - Hath left to their disputes, perhaps to move His laughter at their quaint opinions wide Hereafter ; when they come to model Heaven And calculate the stars, how they will wield The mighty frame ; how build, unbuild, contrive To save appearances ; how gird the sphere With centric and eccentric scribbled o'er, Cycle and epicycle, orb in orb...
Página 208 - ... she is in the meridian of that place ; and that the sun performs a secondary part in their production may be proved from the circumstance, that the highest tides take place when the sun, the moon, and the earth are in the same straight line, that is, when the force of the sun conspires with that of the moon, and that the lowest tides take place when the lines drawn from the sun and moon to the earth are at right angles to each other, that is, when the force of the sun acts in opposition to that...
Página 298 - Herculis. The velocity of this motion is such that the sun, with the whole cortege of bodies depending on him, advances annually in the direction indicated, through a space equal to 1.623 radii of the terrestrial orbit or one hundred and fifty-four millions of miles.
Página 13 - The vertical circle which passes through the north and south points of the horizon is the same as the celestial meridian, which will be defined hereafter (32).
Página 237 - ... feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile; Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half, and Neptune a good-sized plum on a circle about two miles and a half in diameter.
Página 82 - It is found to be always exactly perpendicular to the plane of the horizon; or, to a plane tangent to the surface of the earth at the point of observation.
Página 279 - ... reduce the intensity to onesixteenth : in short, we thus demonstrate the law that the intensity of light diminishes as the square of the distance increases. This is the celebrated law of Inverse Squares as applied to light.