On the Connexion of the Physical SciencesJ. Murray, 1834 - 458 pages |
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Page 17
... Secular Inequalities . In consequence of the latter kind of disturbances , the apsides , or extremities of the major axes of all the orbits , have a direct but variable motion in space , excepting those of the orbit of Venus , which are ...
... Secular Inequalities . In consequence of the latter kind of disturbances , the apsides , or extremities of the major axes of all the orbits , have a direct but variable motion in space , excepting those of the orbit of Venus , which are ...
Page 18
... secular changes ; they are so connected by Kepler's law of the squares of the periodic times being pro- portional to the cubes of the mean distances of the planets from the sun , that one cannot vary without affecting the other . With ...
... secular changes ; they are so connected by Kepler's law of the squares of the periodic times being pro- portional to the cubes of the mean distances of the planets from the sun , that one cannot vary without affecting the other . With ...
Page 19
... secular as well as periodic , are expressed analytically by the sines and cosines of circular arcs , which increase with the time ; and , as a sine or cosine can never exceed the radius , but must oscillate between zero and unity ...
... secular as well as periodic , are expressed analytically by the sines and cosines of circular arcs , which increase with the time ; and , as a sine or cosine can never exceed the radius , but must oscillate between zero and unity ...
Page 20
... secular variation of 457 , occasioned by the re- ciprocal action of the planets ; but , as this is also periodical , and cannot exceed 3o , the terrestrial equator , which is inclined to it at an angle of about 23 ° 27 ′ 34 ′′ 5 , will ...
... secular variation of 457 , occasioned by the re- ciprocal action of the planets ; but , as this is also periodical , and cannot exceed 3o , the terrestrial equator , which is inclined to it at an angle of about 23 ° 27 ′ 34 ′′ 5 , will ...
Page 21
... secular variations in the planetary orbits would have been extremely embarrassing to astronomers when it became necessary to compare observations separated by long periods . The difficulty was in part obviated , and the principle for ...
... secular variations in the planetary orbits would have been extremely embarrassing to astronomers when it became necessary to compare observations separated by long periods . The difficulty was in part obviated , and the principle for ...
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Common terms and phrases
action appears atmosphere attraction caloric cause celestial bodies centre centrifugal force chemical decomposition colours comet compression consequently degree density diameter diminishes direction distance disturbing earth ecliptic effects electric currents equal equator equilibrium equinox ether extremely fluid force galvanometer glass globe gravitation heat increase induction inequalities intensity Jupiter latent heat latitude length liquid longitude lunar magnetic major axis mass mean motion meridian miles moon nearly nebulæ needle nodes nutation observed occasions ocean opposite optic optic axis orbit oscillations parallax particles passing perigee perihelion period perpendicular phenomena plane plate poles position produce proved quantity ray of light reflected refraction revolution revolve right angles rings rotation satellites Saturn secular sensible Sir Edward Parry solar sound space spheroid substances sun and moon sun's surface temperature terrestrial theory tides tion tourmaline transmitted tricity undulations variation velocity vibrations voltaic waves whence wire
Popular passages
Page 29 - ... 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 20 - In song and dance about the sacred Hill — Mystical dance, which yonder starry sphere Of planets and of fixed 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 21 - that must render the name for ever memorable in science, and revered by those who delight in the contemplation of whatever is excellent and sublime." After Newton's discovery of the mechanical laws of the elliptical orbits of the planets, La Grange's discovery of their periodical inequalities is, without doubt, the noblest truth in physical astronomy ; and, in respect of the doctrine of final causes, it may be regarded as the greatest of all.
Page 386 - 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.
Page 110 - D'Alembert, was the Precession of the equinoxes and the Nutation of the earth's axis, according to the theory of gravitation.
Page 310 - ... that is, in the plane which passes through the north and south magnetic poles. There are places where the magnetic meridian coincides with the terrestrial meridian ; in these a magnetic needle freely suspended, points to the true north, but if it be carried successively to different places on the earth's surface, its direction will deviate sometimes to the east and sometimes to the west of north. Lines drawn on the globe through all the places where the needle points due north and south, are...
Page 357 - Hence arises still further confirmation, if any were required, of the identity of common and voltaic electricity, and that the differences of intensity and quantity are quite sufficient to account for what were supposed to be their distinctive qualities.
Page 175 - ... follows, that the orange and green rays of the spectrum, though they cannot be decomposed by prismatic refraction, can be decomposed by absorption, and actually consist of two different colours possessing the same degree of refrangibility.
Page 51 - ... solid parts, by their cohesion, nearly destroy that part of the centrifugal force which gives the particles a tendency to accumulate at the equator, though not altogether ; otherwise the sea, by the superior mobility of its particles, would flow towards the equator and leave the poles dry. Besides, it is well known, that the continents at the equator are more elevated than they are in higher latitudes. It is also necessary for the equilibrium of the ocean, that its density should be less than...