The Story of the SunCassell, limited, 1893 - 376 pages |
Other editions - View all
Common terms and phrases
accuracy actual angle appear Arcturus astronomers atmosphere attraction body bright celestial centre character chromosphere circumstances climate considerable corona course dark lines degree determined diameter disc doubt Earth Earth's orbit element ethereal waves fact faculæ globe gravitation happen heat heavens hydrogen Ice Age illustration indicated interval investigation iron known length light limb luminary lunar eclipse magnetic storm Mars mass mean distance measured method miles a second minor planet minute molecules Moon move movement northern hemisphere object observations Observatory obtained period phenomena phenomenon photographic photosphere planet plate pole position precision present principle produced Professor prominences proper motion quantity radiation regard remarkable result revolving rotation satellite seems seen solar eclipse solar prominences Solar spectrum Solar System spectroscope speed spots stars sufficient Sun-spots Sun's distance suppose surface telescope temperature terrestrial tion total eclipse Transit of Venus undulations Uranus vapour velocity vibrations visible waves zodiacal light
Popular passages
Page 10 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Page 234 - This result, it seems to me, is absolutely conclusive against the supposition that terrestrial magnetic storms are due to magnetic action of the sun ; or to any kind of dynamical action taking place within the sun, or in connection with hurricanes in his atmosphere, or anywhere near the sun outside.
Page 48 - ... making this observation ; and I earnestly wish them all imaginable success ; in the first place that they may not by the unseasonable obscurity of a cloudy sky be deprived of this most desirable sight ; and then that, having ascertained with more exactness the magnitudes of the planetary orbits, it may redound to their immortal fame and glory.
Page 119 - It follows that if the whole earth were heated to the temperature of the sun, its spectrum would resemble very closely the solar spectrum.
Page 234 - Thus, in this 8 hours of a not very severe magnetic storm, as much work must have been done by the Sun in sending magnetic waves out in all directions through space as he actually does in 4 months of his regular heat and light. This result...
Page 88 - ... that the squares of the periodic times are proportional to the cubes of the mean distances of the planets from the Sun.
Page 228 - In that same period we have three great sun spot dis plays — counting the two groups of April, 1882, together — which stand out with equal distinctness far above all other similar displays. And we find that the three magnetic storms were simultaneous with the greatest development of the spots. Is there any escape from the conclusion that the two have a real and binding connection ? It may be direct, it may be indirect and secondary only, but it must be real and effective.
Page 288 - Restated, the standard deviation (sigma) is the square root of the mean of the squares of the deviations from the mean of a distribution.
Page 199 - ... showed a very different state of affairs. Extending between the umbrae, in a direction slightly inclined to the Sun's equator, was a perfectly straight and exceedingly brilliant object, which expanded slightly at its eastern extremity, and turned sharply toward the north, terminating abruptly in a brilliant ball just east of the center of the northern umbra. The sudden formation of this remarkable object did not seem to affect the general group of fáculas surrounding the spot, for they remained...