The Observatory, Volume 51Editors of the Observatory, 1928 Some vols. for 1886- include a special issue: Annual companion to the Observatory. |
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Expressions et termes fréquents
absolute magnitudes amplitude appears Astronomer Royal atmosphere atoms bright BRITISH ASTRONOMICAL ASSOCIATION calculated centre Cepheids chromosphere Cidenas clock clouds coefficient colour Comet computed corona Crommelin curve Decl density determination diameter disc discussion distance disturbance double stars eclipse Eddington effect equatorial formula Fraunhofer lines FREE PENDULUM galactic geoid give given globular clusters Greenwich Hipparchus intensity interesting June Jupiter Küstner latitude Leiden Lick Observatory light limb lines longitude magnitude Maunder mean measured meeting meridian meteors method Moon nebula Nova novæ observations Observatory obtained orbit paper parallaxes parsecs period photographs photospheric planet plates present President probable error Prof prominences proper motions radiation remarked reversing layer rotation Royal Astronomical Society Shortt showed solar spectra spectral type spheroid spots stars Steavenson stellar suggested sun-spots Sun's SYNCHRONOME telescope temperature theory tion UNIV variable variable stars variation velocity wave-lengths
Fréquemment cités
Page 69 - ... field of survey for the present. In the course of a year his mind was accustomed to pass in a grand solar sweep through all the zodiacal signs of the intellectual heaven. Sometimes it was in the Ram, sometimes in the Bull ; one month he would be immersed in alchemy, another in poesy ; one month in the Twins of astrology and astronomy ; then in the Crab of German literature and metaphysics. In justice to him it must be stated that he took such studies as were immediately related to his own profession...
Page 45 - The Distribution over the British Isles of the Average Number of Days with Rain during each Month of the Year.
Page 68 - Keep always with you," he wrote, " wherever your course may lie, the company of great thoughts, the inspiration of great ideals, the example of great achievements, the consolation of great failures. So equipped, you can face without perturbation the buffets of circumstance, the caprice of fortune, all the inscrutable vicissitudes of life.
Page 186 - Nebulae hitherto discovered, whether gaseous or stellar, irregular, planetary, ring-formed, or elliptic, exist within the limits of the sidereal system. They all form part and parcel of that wonderful system, whose nearer and brighter parts constitute the glories of our nocturnal heavens.
Page 187 - Ptolemy showed by evidence, which, from his standpoint, looked as sound as that which we have cited, that the earth was fixed in the center of the universe. May we not be the victims of some fallacy, as he was?
Page 186 - sidereal system is altogether more complicated, altogether more varied in structure, than has hitherto been supposed. Within one and the same region co-exist stars of many orders of real magnitude, the greatest being thousands of times larger than the least. All the nebulae hitherto discovered, whether gaseous or stellar, irregular, planetary, ringformed or elliptic, exist within the limits of the sidereal system " *. Proctor maintained that this view did not reduce the scale of the stellar Universe.
Page 187 - ... the dark nebulosity which marks the great rift in the galaxy. Stellar aggregations, seen above and below the obscuring clouds in the manner familiar in edge-on spirals, form the two branches of the Milky Way, extending from Cygnus to Circinus. The diameter of the system is large — 80,000 to 90,000 parsecs, if it may be regarded as coextensive with the system of globular clusters; at least 80,000 parsecs, if the absolute magnitudes of normal BoB2 stars may be assigned to the faint blue stars...
Page 253 - ... interferometer, with which Pease has succeeded in measuring the diameters of several stars, is attached to the upper end of the tube of the Hooker telescope. When its two outer mirrors are separated as far as possible, they unite in a single image beams of starlight entering in paths 20 feet apart. By comparing these images with those observed when the mirrors are 100 inches or less apart, Pease concludes that an increase of aperture to 20 feet or more would be perfectly safe. For the first time,...
Page 257 - FACTOR TABLE FOR THE SIXTH MILLION, CONTAINING THE LEAST FACTOR OF EVERY NUMBER NOT DIVISIBLE BY 2, 3, or 5, BETWEEN 5,000,000 and 6,000,000.
Page 179 - It is the rarest thing for a modern observatory to continue a program of observations through thirty years, let alone 360. The only modern observations that can compare in continuity with the Babylonian are the Greenwich meridian observations which have been maintained since 1750. Against these I have nothing to say, but their analysis is not so simple as it once seemed, and we could do with another Cidenas.