Mechanism of the HeavensJ. Murray, 1831 - 621 pages |
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Page ix
... axis , it becomes flattened at the poles , and bulges at the equa- tor , in consequence of the centrifugal force arising from the velocity of rotation . For , the centrifugal force diminishes the gravity of the particles at the equator ...
... axis , it becomes flattened at the poles , and bulges at the equa- tor , in consequence of the centrifugal force arising from the velocity of rotation . For , the centrifugal force diminishes the gravity of the particles at the equator ...
Page x
... axis of rotation , and the reaction of that matter on the moon is the cause of a corresponding nutation in the lunar orbit . If a sphere at rest in space receives an impulse passing through its centre of gravity , all its parts will ...
... axis of rotation , and the reaction of that matter on the moon is the cause of a corresponding nutation in the lunar orbit . If a sphere at rest in space receives an impulse passing through its centre of gravity , all its parts will ...
Page xiii
... axis of the earth's orbit to accomplish a sidereal revolu- tion , and 20935 years to complete its tropical motion . The major axis of Jupiter's orbit requires no less than 197561 years to perform its revolution from the disturbing ...
... axis of the earth's orbit to accomplish a sidereal revolu- tion , and 20935 years to complete its tropical motion . The major axis of Jupiter's orbit requires no less than 197561 years to perform its revolution from the disturbing ...
Page xix
... axis of a telescope directed to it ; but if the earth were to begin to move in its orbit with its usual velocity , these rays would strike against the side of the tube ; it would therefore be necessary to incline the telescope a little ...
... axis of a telescope directed to it ; but if the earth were to begin to move in its orbit with its usual velocity , these rays would strike against the side of the tube ; it would therefore be necessary to incline the telescope a little ...
Page xxiii
... axis of the terrestrial orbit to do the same . It is evident that the same secular variation which changes the sun's distance from the earth , and occasions the acceleration in the moon's mean motion , must affect the motion of the ...
... axis of the terrestrial orbit to do the same . It is evident that the same secular variation which changes the sun's distance from the earth , and occasions the acceleration in the moon's mean motion , must affect the motion of the ...
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Common terms and phrases
A₁ action angle ascending node attraction axes axis becomes c'mv centre of gravity centrifugal force co-ordinates coefficients comets computed conic sections consequently cosines curve density depending determined differential direction disturbing forces dR dR dt dt earth eccentricity ecliptic elements epoch equal equilibrium equinoxes fixed plane fluid functions give hence inclination indefinitely small integral Jupiter latitude mass mean anomaly mean distance mean longitude mean motion moon moon's move nearly observation omitted orbit of Jupiter oscillations parallax particle perigee perihelion perturbations planets preceding equation radius vector ratio regard retrograde motion rotation satellites Saturn secular inequalities secular variations sidereal sine spheroid square substituted surface system of bodies terrestrial theory tion true longitude Uranus velocity whence zero δα δε δυ
Popular passages
Page xv - That day, as other solemn days, they spent In song and dance about the sacred hill ; Mystical dance, which yonder starry sphere Of planets, and of fix'd, in all her wheels Resembles nearest, mazes intricate, Eccentric, intervolved, yet regular Then most, when most irregular they seem ; And in their motions harmony divine So smooths her charming tones, that God's own ear Listens delighted.
Page xviii - ... 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 vii - His works, but trace, with precision, the operation of His laws, use the globe he inhabits as a base wherewith to measure the magnitude and distance of the sun and planets, and make the diameter of the earth's orbit the first step of a scale by which he may ascend to the starry firmament. Such pursuits, while they ennoble the mind, at the same time inculcate humility, by showing that there is a barrier which no energy, mental or physical, can ever enable us to pass: that, however profoundly we may...
Page xlix - An account of experiments for determining the length of the pendulum vibrating seconds in the latitude of London.
Page xiv - 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 lxix - If the attraction of the sun for the огпtre of the earth, and of the hemisphere diametrically opposite to him, were diminished by a difficulty in penetrating the interposed matter, the tides would be more obviously affected. Its attraction is the same also, whatever the substances of the celestial bodies may be; for if the action of...
Page vi - is to inspire the love of truth, of wisdom, of beauty — especially of goodness, the highest beauty — and of that supreme and eternal Mind, which contains all truth and wisdom, all beauty and goodness. By the love or delightful contemplation and pursuit of these transcendent aims, for their own sake only, the mind of man is raised from low and perishable objects, and prepared for those high destinies which are appointed for all those who are capable of them.
Page xii - ... depends upon the velocity with which they were first propelled in space. Had that velocity been such as to make the planets move in orbits of unstable equilibrium, their mutual attractions might have changed them into parabolas, or even hyperbolas, so that the earth and planets might, ages ago, have been sweeping far from our sun through the abyss of space.
Page lxiv - Jupiter ; it then gradually diminished in splendor, and having exhibited all the variety of tints that indicate the changes of combustion, vanished sixteen months after its discovery, without altering its position. It is impossible to imagine anything more tremendous than a conflagration that could be visible at such a distance.