On the Connexion of the Physical Sciences |
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Page 14
... their mutual disturbances only increase or diminish the eccentricities of their orbits by very minute quantities ; consequently , the magnitude of the sun's mass is the principal cause of the stability of the system .
... their mutual disturbances only increase or diminish the eccentricities of their orbits by very minute quantities ; consequently , the magnitude of the sun's mass is the principal cause of the stability of the system .
Page 15
The difference between the two is called the equation of the centre , which consequently vanishes at the apsides , and is at its maximum ninety degrees distant from these points , or in quadratures , where it measures the eccentricity ...
The difference between the two is called the equation of the centre , which consequently vanishes at the apsides , and is at its maximum ninety degrees distant from these points , or in quadratures , where it measures the eccentricity ...
Page 29
... notwithstanding the secular inequalities to which they are liable . They extend to the synodic motions of the satellites , consequently they affect their eclipses , and have a very great influence on their whole theory .
... notwithstanding the secular inequalities to which they are liable . They extend to the synodic motions of the satellites , consequently they affect their eclipses , and have a very great influence on their whole theory .
Page 35
The variation , which is at its maximum when the moon is 45o distant from the sun , vanishes when that distance amounts to a quadrant , and also when the moon is in conjunction and opposition ; consequently , that ...
The variation , which is at its maximum when the moon is 45o distant from the sun , vanishes when that distance amounts to a quadrant , and also when the moon is in conjunction and opposition ; consequently , that ...
Page 40
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 nodes and perigee ; and it consequently appears , from theory as ...
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 nodes and perigee ; and it consequently appears , from theory as ...
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according action angle appears arising atmosphere attraction axis becomes bodies cause centre changes colours comet consequently continued currents density depends determined diameter diminishes direction distance disturbing earth ecliptic effect electricity equal equator existence experiments extent extremely fluid force give given glass gravitation greater heat height increase influence intensity kind known latitude length less light liquid magnetic mass matter mean measured meridian miles moon motion move nature nearly needle object observed occasions ocean opposite orbit particles passing period phenomena plane plate polarized poles position probably produce proved quantity rays reflected refraction remain rest result revolve rings rotation round satellites seen separated side similar solar solid sound space square stars substances surface temperature terrestrial theory tides tion transmitted undulations variation varies vibrations waves whole 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...
Bibliographic information
| Title | On the Connexion of the Physical Sciences |
| Author | Mary Somerville |
| Publisher | J. Murray, 1834 |
| Original from | the New York Public Library |
| Digitized | 26 Jun 2006 |
| Length | 458 pages |
| Export Citation | BiBTeX EndNote RefMan |