The Observatory, Volume 48Editors of the Observatory, 1925 Some vols. for 1886- include a special issue: Annual companion to the Observatory. |
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Common terms and phrases
absolute magnitude absorption appears Astrographic Astronomer Royal atmosphere atoms binary bright calcium Cambridge catalogue centre Cepheids chromosphere comet Commission comparison curve Decl deduced density determination diameter discussion distance double stars Earth eclipse Eddington error faculæ Flamsteed flocculi give given Greenwich height hydrogen hydrogen lines instruments interesting International Astronomical Union investigation Jeans Kapteyn km./sec latitude limb lines luminosity Mars mass mean measures meeting meridian meteors method Moon motion nebula Nova observations Observatory obtained orbit paper parallax parsecs period photographic planets plates polar present President Prof prominences proper-motions radial velocities radiation pressure refractor regions remarks rotation Royal Astronomical Society Royal Observatory Sir Frank Dyson Sirius slide solar spectra spectral classes spectral type spectroscopic spectrum spiral nebulæ spots stellar suggested sun-spots Sun's telescope temperature theory Union variable stars variation wave-lengths XLVIII zones
Popular passages
Page 291 - Arts, our astronomical observator, 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 291 - WHEREAS, in order to the finding out of the longitude of places for perfecting navigation and astronomy...
Page 393 - ... the path of the focussed rays, so that the images formed from every minute portion of the reflecting surface, while their centres may coincide on the axis of the telescope, all tilt from the focal plane directly as the extreme of aperture is approached, or as the focal point is shifted from the axis. In the Transactions of the Astronomical and Physical Society of Toronto for 1897, Mr.
Page 338 - ... doubt that the spectrum of the companion is in some respects peculiar. The enhanced lines so prominent in the spectrum of Sirius are faint, X 4481 of magnesium being especially noteworthy in this respect. This agrees with the results found for other white dwarf stars. The arc lines are also faint, and the hydrogen lines form the principal feature of the spectrum. The distribution of the light in the continuous spectrum is noticeably different from that of the scattered light from Sirius, and...
Page 395 - January of the succeeding year, 1796, he increased his error to eight tenths of a second. As he had unfortunately continued a considerable time in this error before I noticed it, and did not seem to me likely ever to get over it and return to a right method of observing, therefore, though with reluctance, as he was a diligent and useful assistant to me in other respects, I parted with him.
Page 395 - ... began from the beginning of August last to set them down half a second of time later than he should do according to my observations ; and, in January of the succeeding year, 1796, he increased his error to eight tenths of a second.
Page 11 - ... 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 291 - Greenwich, upon the highest ground, at or near the place where the castle stood, with lodging-rooms for our astronomical observator and assistant, Our will and pleasure is, that according to such plot and design as shall be given you by our trusty and well-beloved Sir Christopher Wren, Knight, our surveyor-general of the place and scite of the said observatory, you cause the same to be fenced in...
Page 104 - METEOROLOGICAL SOCIETY. THE usual monthly meeting of this Society was held on Wednesday, the 20th inst., at the Institution of Civil Engineers (Mr.
Page 213 - Absorption coefficients and the pressure of radiation in the photospheric layers of a star, Ixxxv.