The Observatory, Volume 50Editors of the Observatory, 1927 - Astronomy Some vols. for 1886- include a special issue: Annual companion to the Observatory. |
Other editions - View all
Common terms and phrases
absolute magnitude appears Astronomer Royal astronomical atom azimuthal quantum bright BRITISH ASTRONOMICAL ASSOCIATION catalogue Cepheids chromosphere comet corona correction Crommelin D.Sc Decl deduced determined diameter discussion distance Earth eclipse Eddington electron ephemeris equations Equatorial error fireball give given Greenwich indicate instruments interest investigation June Jupiter latitude layer Lick Observatory light limb lines longitude luminosity magnetic mass mean measured Merton meteorological meteors method mirror Moon nebula Newton object observations Observatory obtained orbit paper parallax perihelion period Perseids photographs planets plates present President prime meridian Prof proper motions Quadrantids quantum numbers Radiant recent refractor region rotation Royal ROYAL METEOROLOGICAL SOCIETY Royal Observatory seems slide Society solar spectra spectral type spectrum spiral spots stars Steavenson stellar suggested surface taken telescope temperature theory variable variable stars variation velocity wave-length
Popular passages
Page 272 - our astronomical observer" at a salary of £100 per annum, his duty being "forthwith to apply himself with the most exact care and diligence to the rectifying the tables of the motions of the heavens and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting the art of navigation.
Page 275 - That the Conference proposes to the Governments here represented the adoption of the meridian passing through the centre of the transit instrument at the Observatory of Greenwich, as the initial meridian for longitude.
Page 97 - THE Bruce Gold Medal of the Astronomical Society of the Pacific for 1927 has been awarded to Prof.
Page 99 - Report of the Superintendent of the US naval observatory for the year ending June 30.
Page 386 - ... one on San Antonio Peak, California, to be used as a base line in the determination of the velocity of light, Professor Michelson made a request on May 1, 1920, upon the Director of the United States Coast and Geodetic Survey, Colonel E. Lester Jones, that the work be done. The Director, realizing that the determination of the velocity of light with great accuracy might lead to the determination of distance in terms of the velocity of light and thus might furnish a means of measuring base lines...
Page 149 - NEWTON'S ACHIEVEMENT The significance, however, of Newton's achievement lay not only in its provision of a serviceable and logically satisfactory basis for mechanics proper ; up to the end of the nineteenth century it formed the program of all theoretical physical research. All physical phenomena were to be referred to masses subject to Newton's law of motion. Only the law of force had to be amplified and adapted to the type of phenomena which was being considered. Newton himself tried to apply this...
Page 98 - ... magnitudes are related by the formula mT = C— 5 log d. The constant C, expressing the magnitude for a given diameter, or the diameter for a given magnitude, increases smoothly throughout the sequence. When the values of C are reduced to that for a given type, a single formula represents all the nebulae from the Magellanic Clouds to the faintest that can be classified with the 100-inch reflector. Nuclear magnitudes as measured by Hopmann lead to the same results. It appears that the nuclei,...
Page 195 - ... photography of nebulae has been continued by Hubble, Humason, and Dr. Duncan, partly for classification purposes and partly for the detailed study of interesting objects. From a comparison of two photographs of the Net Work Nebula in Cygnus taken 15 years apart, Hubble finds an expansion at the rate of 10
Page 273 - Firstly, that the unification of longitudes and hours is equally desirable in the interests of science as in those of navigation, commerce, and international communication. The scientific and practical utility of this reform considerably outweighs the sacrifices and the trouble of arrangement to which it will put the minority of civilized nations. It should, therefore, be recommended to the governments of all the states...
Page 198 - Russell finds a principal ionization potential of 6-8o volts for the neutral atom, and 1y6 volts for the ionized atom. This is the first time that the ionization potential has been determined for a complex spark spectrum. In connection with his measurement of ultra-violet solar radiation Pettit has made a laboratory investigation of the absorption properties of ozone and water vapour. The constants of absorption of ozone in the region X...