On the Connection of the Physical SciencesHarper & brothers, 1846 - 460 pages |
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Page vi
... Distances - Mean Distance of the Sun from the Earth obtained from Lunar Theory - Abso- lute Distances of the Planets , how found Page 33 SECTION VI . Form of the Earth and Planets - Figure of a Homogeneous Spheroid in Rotation - Figure ...
... Distances - Mean Distance of the Sun from the Earth obtained from Lunar Theory - Abso- lute Distances of the Planets , how found Page 33 SECTION VI . Form of the Earth and Planets - Figure of a Homogeneous Spheroid in Rotation - Figure ...
Page 4
... mean distance ( N. 14 ) of the moon from the earth is about sixty times the mean radius ( N. 15 ) of the earth . When the number 16.0697 is diminished in the ratio ( N. 16 ) of 1 to 3600 , which ATTRACTION OF A SPHERE . SECT . I.
... mean distance ( N. 14 ) of the moon from the earth is about sixty times the mean radius ( N. 15 ) of the earth . When the number 16.0697 is diminished in the ratio ( N. 16 ) of 1 to 3600 , which ATTRACTION OF A SPHERE . SECT . I.
Page 5
... distance ( N. 17 ) from the earth's center , estimated in terrestrial radii ... distances from his cen- ter ; the sun , therefore , is the center of a force extend- ing ... mean distances from his center ( N. 26 ) . Hence the intensity of ...
... distance ( N. 17 ) from the earth's center , estimated in terrestrial radii ... distances from his cen- ter ; the sun , therefore , is the center of a force extend- ing ... mean distances from his center ( N. 26 ) . Hence the intensity of ...
Page 8
... Mean and True Motion - Equinoctial - Ecliptic - Equi- noxes - Mean and True Longitude - Equation of Center ... distance of a planet from the sun is equal to half the major axis ( N. 42 ) of its orbit : if , therefore , the planet described a ...
... Mean and True Motion - Equinoctial - Ecliptic - Equi- noxes - Mean and True Longitude - Equation of Center ... distance of a planet from the sun is equal to half the major axis ( N. 42 ) of its orbit : if , therefore , the planet described a ...
Page 9
Mary Somerville. its mean distance , the motion would be uniform , and the periodic time unaltered , because the planet would arrive at the extremities of the major axis at the same instant , and would have the same velocity , whether it ...
Mary Somerville. its mean distance , the motion would be uniform , and the periodic time unaltered , because the planet would arrive at the extremities of the major axis at the same instant , and would have the same velocity , whether it ...
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Common terms and phrases
action appears atmosphere attraction bodies caloric cause centrifugal force chemical color comet computed consequently crystal degree density diameter diminishes direction disturbing earth ecliptic effect electricity equal equator ether extremely fluid galvanometer glass globe gravitation greater heat increase inequalities intensity Jupiter Jupiter's latitude length less light liquid longitude luminous lunar magnetic major axis mass mean distance mean motion meridian metal miles moon move nearly nodal lines nodes NOTE nutation observations ocean optic axis orbit oscillations parallax particles passing perigee perihelion periodic phenomena planet plate polarized poles position produce quantity rays reflected refraction refrangible retrograde motion revolution revolving right angles rings rotation satellites secular secular variation Sir John Herschel Sir William Herschel solar spectrum sound space square stars substances sun's surface temperature terrestrial theory tion tourmaline transmitted tricity undulations variation velocity vibrations Voltaic waves wire
Popular passages
Page 374 - a thousand years are as one day, and one day as a thousand years.
Page 381 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Page 21 - A singular law obtains among the mean motions and mean longitudes of the first three satellites. It appears from observation that the mean motion of the first satellite, plus twice that of the third, is equal to three times that of the second ; and 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. It is proved by theory, that if these...
Page 407 - Whatever the reflecting surface may be, and however obliquely the light may fall upon it, the angle of reflection is always equal to the angle of incidence. Thus...
Page 282 - The spark taken in the same manner from zinc, cadmium, tin, bismuth, and lead, in the melted state, gives similar results ; but the number, position, and colours of the lines vary in each case. The appearances are so different that, by this mode of examination, the metals may be readily distinguished from each other.
Page 349 - Swan, which, after becoming invisible, reappeared, and having undergone many variations in light, vanished after two years, and has never since been seen. In 1572 a star was discovered in Cassiopeia, which rapidly increased in brightness till it even surpassed that of 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...
Page 78 - about 30° eastward of the moon, where it is always high water both in the hemisphere where the moon is and in that which is opposite. On the west side of this circle the tide is flowing, on the east it is ebbing, and on every part of the meridian at 90° distant it is low water.
Page 368 - ... of volcanic eruption. It has even been computed, that if a stone were projected from the moon in a vertical line, with an initial velocity of 10,992 feet in a second, — more than four times the velocity of a ball when first discharged from a cannon, — instead of falling back to the moon by the attraction of gravity, it would come within the sphere of the earth's attraction, and revolve about it like a satellite. These bodies, impelled either by the direction of the primitive impulse, or by...
Page 221 - John thence concludes — 1st. That it is the heat of these rays, not their light, which operates the change ; 2ndly. That this heat possesses a peculiar chemical quality which is not possessed by the purely calorific rays outside of the visible spectrum, though far more intense ; and, 3rdly. That the heat radiated from obscurely hot iron, abounds especially in rays analogous to those of the region of the spectrum above indicated.
Page 274 - ... were distinctly visible. Day broke very slowly, and the sun rose of a fiery and threatening aspect. Rain followed. Captain Bonnycastle caused a bucket of this fiery water to be drawn up ; it was one mass of light when stirred by the hand, and not in sparks as usual, but in actual coruscations.