History of Astronomy |
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Page 73
He now said that the nodes of a ring of satellites revolving round the earth's
equator would consequently all regress. And if joined into a solid ring its node
would regress; and it would do so, only more slowly, if encumbered by the
spherical part ...
He now said that the nodes of a ring of satellites revolving round the earth's
equator would consequently all regress. And if joined into a solid ring its node
would regress; and it would do so, only more slowly, if encumbered by the
spherical part ...
Page 93
It is very probable that the Chaldaens may have made spheres, like the armillary
sphere, for representing the poles of the heavens; and with rings to show the
ecliptic and zodiac, as well as the equinoctial and solstitial colures; but we have
no ...
It is very probable that the Chaldaens may have made spheres, like the armillary
sphere, for representing the poles of the heavens; and with rings to show the
ecliptic and zodiac, as well as the equinoctial and solstitial colures; but we have
no ...
Page 94
... In 148o Martin Behaim, of Nuremberg, produced his astrolabe for measuring
the latitude, by observation of the sun, at sea. It consisted of a graduated metal
circle, suspended by a ring which was passed over the thumb, and hung
vertically.
... In 148o Martin Behaim, of Nuremberg, produced his astrolabe for measuring
the latitude, by observation of the sun, at sea. It consisted of a graduated metal
circle, suspended by a ring which was passed over the thumb, and hung
vertically.
Page 133
During a minimum the nebulous ring seems to be made of tufts of fine hairs with
aigrettes or radiations from both poles, and streamers from the equator. On
September 19th, 1868, eclipse spectroscopy began with the Indian eclipse, in
which ...
During a minimum the nebulous ring seems to be made of tufts of fine hairs with
aigrettes or radiations from both poles, and streamers from the equator. On
September 19th, 1868, eclipse spectroscopy began with the Indian eclipse, in
which ...
Page 140
for by known planets; and Le Verrier * has stated that an intra-Mercurial planet or
ring of asteroids would account for the unexplained part of the motion of the line
of apses of Mercury's orbit amounting to 38" per century. - Mars. — The first study
...
for by known planets; and Le Verrier * has stated that an intra-Mercurial planet or
ring of asteroids would account for the unexplained part of the motion of the line
of apses of Mercury's orbit amounting to 38" per century. - Mars. — The first study
...
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Common terms and phrases
accurate Airy ancient Astronomer Royal astronomical units bright calculations Cape catalogue centre century Chaldaeans Chinese comet Copernicus diameter discovered discovery earth Egyptian epicycles equatorial error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus History of Astronomy Huggins instruments JOHANNEs KEPLER John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance measured ment Mercury meteor miles a second moon nebulae Newton º º observations Observatory orbit parallax period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolving round ring rotation satellites Saturn seems showing Sir William Herschel Sirius solar eclipse solar system spectra spectroscope spectrum sphere spots stellar sun-spot supposed tables telescope theory tion Trans Tycho Brahe universal gravitation Uranus velocity Venus Verrier
Popular passages
Page 67 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 26 - So he sate and cunningly guided the craft with the helm, nor did sleep fall upon his eyelids, as he viewed the Pleiads and Bootes, that setteth late, and the Bear, which they likewise call the Wain, which turneth ever in one place, and keepeth watch upon Orion, and alone hath no part, in the baths of Ocean. This star, Calypso, the fair goddess, bade him to keep ever on the left as he traversed the deep.
Page 53 - The third, viz. that the squares of the periodic times are proportional to the cubes of the mean distances...
Page 79 - Wherefore if according to what we have already said it should return again about the year 1758, candid posterity will not refuse to acknowledge that this was first discovered by an Englishman.
Page 122 - ... They have not been regarded as so successful as his geometrical analysis of the observed phenomena. It is only just to add that he himself did not attach equal weight to them ; for in answer to objections urged by Lalande to his theory that the spots are depressions, Wilson wrote thus in 1783 : — ' Whether their first production and subsequent numberless changes depend upon the eructation of elastic vapours from below, or upon eddies or whirlpools commencing at the surface, or upon the dissolving...
Page 51 - He then said boldly that it was impossible that so good an observer as Tycho could be wrong by eight minutes* and added, " out of these eight minutes we will construct a new theory that will explain the motions of all the planets.
Bibliographic information
| Title | History of Astronomy Hist. of sci. series History of the sciences |
| Author | George Forbes |
| Publisher | Putnam, 1909 |
| Original from | the University of California |
| Digitized | 29 Nov 2007 |
| Length | 200 pages |
| Export Citation | BiBTeX EndNote RefMan |