Publications of the Astronomical Society of the Pacific, Volume 16Astronomical Society of the Pacific., 1904 |
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819 Market Street annual Appendix asteroids Astronomical Department Astronomical Society Astronomische Astrophysical Journal Atlas August Berkeley Board of Directors bright brighter Bruce Medal BURCKHALTER California catalogue comet Comet-Medal Committee copies curve CUSHING December determination double stars epoch equatorial exposure F. R. ZIEL focal length Fund Greenwich instrument interest January July l'astronomie Leipzig Library Lick Observatory light lines London magnitude measures medal method Mills Expedition minutes Moon Mount Hamilton North Pole O'HALLORAN observations orbit Pacific pairs parallax Paris photographic PIERSON planet plates positions Potsdam Professor proper motion Publications R. G. AITKEN refraction Ring Nebula S. D. TOWNLEY San Francisco Secretary September slit Solar Eclipses spectra spectrograph spectroheliograph spectroscopic spectrum stellar Sternwarte Sun's telescope temperature tion U. S. Naval Observatory variable stars velocity volume W. W. CAMPBELL Washington wave-lengths WILLIAM HUGGINS Yerkes Observatory York
Popular passages
Page 61 - First the flaming red Sprung vivid forth ; the tawny orange next ; And next delicious yellow ; by whose side Fell the kind beams of all-refreshing green. Then the pure blue, that swells autumnal skies, Ethereal...
Page 56 - The riddle of the nebulae was solved. The answer, which had come to us in the light itself, read: Not an aggregation of stars, but a luminous gas.
Page 130 - That all the acts appearing in the minutes of the meetings of the Board of Directors of this Society, as having been done by said Board during the past fiscal year, are here now, by this Society, approved and confirmed.
Page 53 - By means of its light alone to analyze the chemical nature of a far-distant body; to be able to reason about its present state in relation to the past and future ; to measure within an English mile or less per second the otherwise invisible motion which it may have towards or from us; to do more, to make even that which is darkness to our eyes light, and from vibrations which our organs of sight are powerless to perceive to evolve a revelation in which we see mirrored some of the stages through which...
Page 235 - ... It is doubtful if the conditions of density and internal motion in the Sun and spark are sufficiently alike to warrant this procedure. But until better determinations of spark wave-lengths are available, there seems to be no alternative. A careful discussion of the matter by FROST and ADAMS* has led to the conclusion that " In 'the present state of our knowledge we ... cannot say with any certainty how much our results are affected by the use of solar wave-lengths for our Ti lines ; but presumably...
Page 247 - Returning again to the rotation interpretation, it is easy to construct a plausible explanation for the light- and velocity-curves of W Sagittarii on the assumption that the system is pervaded by a resisting medium which enhances the brightness of that side of the star which faces the direction of motion. Or, again, a third body might be present in the system and give rise to the perturbations observed by Schmidt in the period. Until more data are available, it would be premature to follow out such...
Page 54 - ... hydrogen in Sirius or in Vega. Iron from our mines was line-matched, light for dark, with stellar iron from opposite parts of the celestial sphere.
Page 57 - ... of an evolution in the past, and still going on, of the heavenly hosts. A time surely existed when the matter now condensed into the sun and planets filled the whole space occupied by the solar system, in the condition of gas, which then appeared as a glowing nebula, after the order, it may be, of some now existing in the heavens. There remained no room for doubt that the nebulae, which our telescopes reveal to us, are the early stages of long processions of cosmical events, which correspond...
Page 53 - Kirchhoffs original work on the solar spectrum and the interpretation of its lines. Since that time a great harvest has been gathered in the same field by many reapers. Spectroscopic astronomy has become a distinct and acknowledged branch of the science, possessing a large literature of its own and observatories specially devoted to it. The more recent discovery of the gelatine dry plate has given a further great impetus to this modern side of astronomy, and has opened a pathway into the unknown...
Page 213 - ... atmosphere, different kinds of evidence agree in supporting the accuracy of the estimates made of it and of the conclusions deduced from them. " The effects due to this absorption having been allowed for, the inference from these observations appears to be that the solar radiation itself fell off by about 10 per cent., beginning at the close of March 1903. I do not assert this without qualification, but if such a change in solar radiation did actually occur, a decrease of temperature on the Earth,...