The Observatory, כרך 14Editors of the Observatory, 1891 "A review of astronomy" (varies). |
מהדורות אחרות - הצג הכל
מונחים וביטויים נפוצים
A. M. W. Downing aperture appears April Astronomer Royal Beaumont House belt binary stars bright Burnham Catalogue centre Chart comet crater dark December determined disk distance double stars eclipse equatorial error exposure faint give Greenwich heliometer Huggins hydrogen line instrument interesting July June Jupiter Knobel latitude Lick Observatory light lines longitude lunar magnitude mean measures meeting meridian meteorological meteors method minutes Moon nearly nebula Neison night noted November object object-glass observations orbit paper parallax period Perseids photographs planet plates position Potsdam present President probably Prof proper motion Red Spot refractor remarkable ring rotation Royal Observatory S. W. Burnham satellite Saturn seen Sept shadow Society solar spectra spectroscope spectrum stellar Swift Tauri telescope temperature tion transit variable variable stars velocity wall ΙΟ
קטעים בולטים
עמוד 408 - ... the sky, and that not by any doubtful amount but by half or threefourths of a magnitude. One of two things was certain, either that the eye observations were wrong, or that the stars of the Milky Way are bluer or whiter than other stars. But Professor Pickering, of Cambridge, America, has lately been making a complete photographic review of the heavens, and by placing a prism in front of the telescope he has made pictures of the whole sky like this. [Here two examples of the plates of Pickering's...
עמוד 425 - Italian lire. 2. Exact nature of the investigation proposed. 3. Conditions under which the research is to be prosecuted. 4. Manner in which the appropriation asked for is to be expended* All applications should reach, before December 10, 1891, the Secretary of the Board of Trustees, Dr.
עמוד 295 - Eayleigh has pointed out, the eye, when its full aperture, is used, is not a perfect instrument. If we wish to realize the full resolving power of a spectroscope, therefore, the emergent beam must not be larger than about one-third of the opening of the pupil. Up to the present time the standard of reference for nearly all spectroscopic work continues to be Angstrom's map of the solar spectrum and his scale based upon his original determinations of absolute wave length.
עמוד 104 - They will be glad to show any new meteorological instruments or apparatus invented or first constructed since last March, as well as photographs and drawings possessing meteorological interest.
עמוד 299 - The spectroscopic method of determining celestial motions in the line of sight has recently become fruitful in a new but not altogether unforeseen direction, for it has, so to speak, given us a separating power far beyond that of any telescope the glass-maker and the optician could construct, and so enabled us to penetrate into mysteries hidden in stars apparently single, and altogether unsuspected of being binary systems. The spectroscope has not simply added to the list of the known binary stars,...
עמוד 296 - Rowland to include in his map the whole visible solar spectrum, as well as the ultra-violet portion as far as it can get through our atmosphere. Some recent photographs of the solar spectrum, which include A, by Mr. George Higgs, are of great technical beauty. During the past year the results of three .independent researches have appeared, in which the special object of the observers has been to distinguish the lines which are due to our atmosphere from those which are truly solar — the maps of...
עמוד 136 - ... in various ways. The main army 'of science moves to the conquest of new worlds slowly and surely, nor ever cedes an inch of the territory gained. But the advance is covered and facilitated by the ceaseless activity of clouds of light troops provided with a weapon — always efficient, if not always an arm of precision — the scientific imagination. It is the business of these enfants perdus of science to make raids into the realm of ignorance whereever they see, or think they see, a chance ;...
עמוד 256 - ... corresponding observations made on the revolving stand at the Royal Observatory, Greenwich. From this it appears that the maximum temperature in the Stevenson screen is lower than that of the revolving stand, especially in summer, and the minimum temperature higher, whilst the readings of the dry and wet bulb thermometers on both the screen and the stand, as taken at stated hours, agree very closely together,— Mr.
עמוד 425 - for the advancement and prosecution of scientific research in its broadest sense," now amounts to §25,000. As the income is already available, the trustees desire to receive applications for appropriations in aid of scientific work. This endowment is not for the benefit of any one department of science, but it is the intention of the trustees to give the preference to those investigations...
עמוד 298 - In the nebulae the elder Herschel saw portions of the fiery mist or " shining fluid " out of which the heavens and the earth had been slowly fashioned. For a time this view of the nebulae gave place to that which regarded them as external galaxies, cosmical " sand heaps," too remote to be resolved into separate stars; though, indeed, in 1858, Mr.