Monthly Notices of the Royal Astronomical Society, Volume 73Priestley and Weale, 1913 Includes lists of additions to the Society's library, usually separately paged. |
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angle anomalous refraction appear approximately Astronomical axis bright band brighter Catalogue centre chromosphere coefficients column Comet comparison correction corresponding curve Cygni deduced density density gradients Deslandres determined diameter disc displacement distance double star eclipse effect epoch equations equatorial exposure faint formula Fourier sequence given gives Greenwich heliographic hydrogen hydrogen lines instrument John Goodricke km./sec latitude limb lines longitude magnetic storms magnitude Mags maximum mean measured method Monthly Notices nebulous Newcomb number of stars observations Observatory obtained orbit P₁ paper parallax period Persei photographic magnitudes photographs photosphere plane plates position probable error Professor prominences proper motions radial velocities region residuals right ascension rotation Royal Royal Observatory slit Society solar atmosphere spectra spectroheliograph spectrum spots sun-spot Sun's Table taken telescope temperature tion values variable variable stars velocity wave-length ΙΟ ΟΣ
Popular passages
Page 194 - To the layman the problem of the three bodies seems so simple that he is surprised to learn that it cannot be solved completely, and yet we know what prodigies of mathematical skill have been bestowed on it. My own work on the subject cannot be said to involve any such skill at all, unless indeed you describe as skill the procedure of a housebreaker who blows in a safe- door with dynamite instead of picking the lock.
Page 180 - Square, W. ; were balloted for and duly elected Fellows of the Society. The names of Four Candidates for admission into the Society were read.
Page 407 - But the data being insufficient, we cannot feel sure that the alteration in the dimensions of the orbits of these satellites has not been considerable. It remains, however, nearly certain that they cannot have first originated almost in contact with the present surfaces of the planets, in the same way as, in previous papers, has been shown to be probable with regard to the moon and earth.
Page 408 - II., § 7, exhibit so striking a difference between the terrestrial system and those of the other planets, that, even apart from the considerations adduced in this and previous papers, we should have grounds for believing that the modes of evolution have been considerably different.
Page 665 - ... the reversed directions of motion of high and low latitude spots has recently been confirmed by Dyson and Maunder, who discussed the extensive observational material comprised in the Greenwich sun-spot measures from 1874 to 1912. They remark: "A slight general tendency is suggested for high-latitude spots in either hemisphere to move away from the equator, but for those in lower latitudes to move toward it."4...
Page 194 - Stormer* to similar tasks as in the computation of the orbits of electrons in the neighbourhood of the earth, thus affording an explanation of some of the phenomena of the aurora borealis. To put at their lowest the claims of this clumsy method, which may almost excite the derision of the pure mathematician, it has served to throw light on the celebrated generalisations of Hill and Poincare. I appeal then for mercy to the applied mathematician and would ask you to consider in a kindly spirit the...
Page 398 - The resulting numbers, divided by 10, are pretty nearly the true mean distances of the planets from the sun, in terms of the radius of the earth's orbit. Professor Young, whose table I am here using, goes on to say that the "law" breaks down completely in the case of Neptune.
Page 259 - Vortex motion is initiated by differences in velocity of adjoining surfaces or by irregularities of structure and is maintained by convection. The circulation in the vortex is vertically upward and then outward along the photosphere, as in a terrestrial tornado. Expansion produces cooling at the center of the vortex, and a comparatively dark area (the umbra) results.
Page 407 - It may be shown that the reaction of the tides raised in the sun by the planets must have had a very small influence in changing the dimensions of the planetary orbits round the sun. From a consideration of numerical data with regard to the solar system and the planetary subsystems it appears improbable that the planetary orbits have been sensibly enlarged by tidal friction since the origin of the several planets...
Page 544 - ... out on the volatilisation and electrical emissivity of a number of metals, mostly in nitrogen at reduced pressures. The metals were heated by alternating current and no applied potential was employed. (1) The emission of positive electricity occurs at temperatures from about 1000° to 1400° C. For metals which melt within this range, a sudden and marked increase in the positive current often occurred at the liquefying point — due probably to the sudden release of occluded gas. (2) Oxygen appears...