History of Astronomy |
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Page x
As photographed at the Royal Observatory, Greenwich, showing sun spots with
umbrae, penumbrae, and jaculae. SoLAR ECLIPSE, 1882. . . . . . . . . . . . . . . . . . . . .
. . . . From the drawing by W. H. Wesley, Secretary, R. A. S.; showing the ...
As photographed at the Royal Observatory, Greenwich, showing sun spots with
umbrae, penumbrae, and jaculae. SoLAR ECLIPSE, 1882. . . . . . . . . . . . . . . . . . . . .
. . . . From the drawing by W. H. Wesley, Secretary, R. A. S.; showing the ...
Page 3
... searched for connection between terrestrial conditions and periods of unusual
prevalence of sun spots; while De la Rue, Loewy, and Balfour Stewart' thought
they found a connection between sun-spot displays and the planetary positions.
... searched for connection between terrestrial conditions and periods of unusual
prevalence of sun spots; while De la Rue, Loewy, and Balfour Stewart' thought
they found a connection between sun-spot displays and the planetary positions.
Page 17
He held that the sun, moon, and stars are not mere spots on the heavenly vault,
but solids; that the moon derives her light from the sun, and that this fact explains
her phases; that an eclipse of the moon happens when the earth cuts off the ...
He held that the sun, moon, and stars are not mere spots on the heavenly vault,
but solids; that the moon derives her light from the sun, and that this fact explains
her phases; that an eclipse of the moon happens when the earth cuts off the ...
Page 60
He found curious irregular black spots on the sun, revolving round it in twenty-
seven days; hills and valleys on the moon; the planets showing discs of sensible
size, not points like the fixed stars; Venus showing phases according to her ...
He found curious irregular black spots on the sun, revolving round it in twenty-
seven days; hills and valleys on the moon; the planets showing discs of sensible
size, not points like the fixed stars; Venus showing phases according to her ...
Page 120
THE SUN One of Galileo's most striking discoveries, when he pointed his
telescope to the heavenly bodies, was that of the irregularly shaped spots on the
sun, with the dark central umbra and the less dark, but more extensive, penumbra
...
THE SUN One of Galileo's most striking discoveries, when he pointed his
telescope to the heavenly bodies, was that of the irregularly shaped spots on the
sun, with the dark central umbra and the less dark, but more extensive, penumbra
...
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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 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 |