The Elements of Astronomy: Or, The World as it Is, and as it AppearsCrocker and Brewster, 1850 - 376 σελίδες |
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Σελίδα vii
... Attraction of Gravita- tion . Effect of Gravitation on the figures of the Sun and Planets . The Figure of the Earth that of Equilibrium . Illustration of the effect of Rotation on a Fluid Mass . Laws of Gravity . Centre of Gravity ...
... Attraction of Gravita- tion . Effect of Gravitation on the figures of the Sun and Planets . The Figure of the Earth that of Equilibrium . Illustration of the effect of Rotation on a Fluid Mass . Laws of Gravity . Centre of Gravity ...
Σελίδα 67
... attraction of all the stars which are nearer to it than we are , and which are estimated to amount to more than 100,000,000 times the mass of our own solar system , is supposed to re- quire upwards of 18,000,000 years for its complete ...
... attraction of all the stars which are nearer to it than we are , and which are estimated to amount to more than 100,000,000 times the mass of our own solar system , is supposed to re- quire upwards of 18,000,000 years for its complete ...
Σελίδα 72
... attraction makes these ellipses similar , and causes the bodies to be in similar points of each ellipse at the same moment , and consequently to lie opposite to one another in a straight line drawn through the centre of gravity . Motion ...
... attraction makes these ellipses similar , and causes the bodies to be in similar points of each ellipse at the same moment , and consequently to lie opposite to one another in a straight line drawn through the centre of gravity . Motion ...
Σελίδα 82
... attraction of the vast globes round which they revolve , would absorb them in their mass . § 127. Although the satellites are usually spoken of as revolving around their primaries , this is not strictly the truth . Each planet with its ...
... attraction of the vast globes round which they revolve , would absorb them in their mass . § 127. Although the satellites are usually spoken of as revolving around their primaries , this is not strictly the truth . Each planet with its ...
Σελίδα 84
... attraction , it would describe an ellipse with the earth in one of the foci , returning to the same place at the end of each month . But as it performs at the same time a small ellipse round the earth and a large ellipse round the sun ...
... attraction , it would describe an ellipse with the earth in one of the foci , returning to the same place at the end of each month . But as it performs at the same time a small ellipse round the earth and a large ellipse round the sun ...
Άλλες εκδόσεις - Προβολή όλων
The Elements of Astronomy, Or the World as It Is, and as It Appears (Classic ... Anna Cabot Lowell Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
The Elements of Astronomy, Or, the World as it Is, and as it Appears Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2020 |
Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...
Σελίδα 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.
Σελίδα 22 - The Latitude of a star is its angular distance from the ecliptic measured on a circle of latitude.
Σελίδα 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.
Σελίδα 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...
Σελίδα 13 - The radius of a sphere, is a straight line drawn from the center to any point of the surface.
Σελίδα 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.
Σελίδα 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...