The Elements of Astronomy: Or, The World as it Is, and as it AppearsCrocker and Brewster, 1850 - 376 pages |
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Page vii
... Saturn . CHAPTER XVII - Precession , Nutation , and Aberration . Action of the Planets on the Plane of the Ecliptic . Action of the Sun and Moon on the Earth's Equator . The Precession of the Equinoxes . Motion of the Earth's Axis ...
... Saturn . CHAPTER XVII - Precession , Nutation , and Aberration . Action of the Planets on the Plane of the Ecliptic . Action of the Sun and Moon on the Earth's Equator . The Precession of the Equinoxes . Motion of the Earth's Axis ...
Page viii
... Saturn . Its Rings and Satellites . Uranus . Neptune . CHAPTER XXII . - The Moon . Size and Mass of the Moon . Its Dis- tance and Period . Revolution of the Nodes of the Lunar Orbit . Appearance of the Moon . Libration . Phases of the ...
... Saturn . Its Rings and Satellites . Uranus . Neptune . CHAPTER XXII . - The Moon . Size and Mass of the Moon . Its Dis- tance and Period . Revolution of the Nodes of the Lunar Orbit . Appearance of the Moon . Libration . Phases of the ...
Page 67
... Saturn are separated by less than one quadrant from each other ; in like manner the centre of gravity of the starry heavens , in the changes among the constellations in the lapse of thousands of years , may fall without Alcyone , or ...
... Saturn are separated by less than one quadrant from each other ; in like manner the centre of gravity of the starry heavens , in the changes among the constellations in the lapse of thousands of years , may fall without Alcyone , or ...
Page 73
... these stars about each other cannot be so small as that of the orbit of Saturn about the sun , and exceeds , in all probability , that of the orbit of Uranus . 7 CHAPTER VI . THE SOLAR SYSTEM . The Primary and ELEMENTS OF ASTRONOMY . 73.
... these stars about each other cannot be so small as that of the orbit of Saturn about the sun , and exceeds , in all probability , that of the orbit of Uranus . 7 CHAPTER VI . THE SOLAR SYSTEM . The Primary and ELEMENTS OF ASTRONOMY . 73.
Page 74
... Hebe , Flora , Metis , and Hygeia , called from their small size , the Asteroids ; Jupiter , Saturn , Uranus , called also Herschel , and Neptune . The Earth is accompanied by one moon ; Jupiter by 74 ELEMENTS OF ASTRONOMY .
... Hebe , Flora , Metis , and Hygeia , called from their small size , the Asteroids ; Jupiter , Saturn , Uranus , called also Herschel , and Neptune . The Earth is accompanied by one moon ; Jupiter by 74 ELEMENTS OF ASTRONOMY .
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The Elements of Astronomy, Or the World as It Is, and as It Appears (Classic ... Anna Cabot Lowell No preview available - 2016 |
Common terms and phrases
altitude angular aphelion appear ascertained astronomical atmosphere attraction axis body called cause celestial centre of gravity centrifugal force circle cluster comet constellations curve density described diameter direction disc distance disturbing earth earth's surface eccentricity ecliptic equal equator equatorial equinoctial feet fixed stars globe greater heat heavens hemisphere Herschel horizon illuminated inclined increase inequalities John Herschel Jupiter Jupiter's latitude length less light longitude lunar mass measure meridian miles minute moon moon's move nearer nearly nebulous nodes nucleus nutation obliquely observed parallax parallel passes perigee perihelion period perpendicular planets polar pole portion position proper motion proportion radius rays refraction revolution revolve right angles right ascension rise rotation satellites Saturn seen shadow side sidereal sidereal day solar system space sphere sun's suppose tail telescope tion Uranus vapor variations velocity Venus vernal equinox vertical visible whole zenith zodiacal light
Popular passages
Page 330 - ... that the mean longitude of the first satellite, minus three times that of the second, plus twice that of the third, is always equal to two right angles.
Page 262 - But, in the midst of all these vicissitudes, the length of the major axes and the mean motions of the planets remain permanently independent of secular changes. They are so connected by Kepler's law, of the squares of the periodic times being proportional to the cubes of the mean distances of the planets from the sun, that one cannot vary without affecting the other.
Page 37 - Now, suppose the head of the screw to be a circle, whose diameter is an inch, the circumference of the head will be something more than three inches : this may be easily divided into a hundred equal parts distinctly visible. If a fixed index be presented to this graduated circumference, the hundredth part of a revolution of the screw may be observed, by noting the passage of one division of the head under the index. Since one entire revolution of the head moves the point through the fiftieth of an...
Page 199 - our astronomical observer" at a salary of £100 per annum, his duty being "forthwith to apply himself with the most exact care and diligence to the rectifying the tables of the motions of the heavens and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting the art of navigation.
Page 22 - The Latitude of a star is its angular distance from the ecliptic measured on a circle of latitude.
Page 13 - A sphere is a solid terminated by a curved surface all the points of which are equally distant from a point within called the centre.
Page 258 - The radial force, or that part of the disturbing force which acts in the direction of the line joining the centres of the sun and disturbed planet, has no effect on the areas, but is the cause of periodical changes of small extent in the distance of the planet from the sun. It has already been shown, that the force producing perfectly elliptical motion varies inversely as the square of the distance, and...
Page 13 - The radius of a sphere, is a straight line drawn from the center to any point of the surface.
Page 38 - Now, the arc of a circle, subtended by one second, is less than the 200,000th part of the radius, so that on a circle of 6 feet in diameter it would occupy no greater linear extent than part of an inch ; a quantity requiring a powerful microscope to be discerned at all.
Page 345 - As the moon can never be full but when she is opposite to the sun, and the sun is never in Virgo and Libra, but in our autumnal months, it is plain that the moon is never full in the opposite signs, Pisces and Aries, but in these two months. And...