Monthly Notices of the Royal Astronomical Society, المجلد 50Priestley and Weale, 1890 Includes lists of additions to the Society's library, usually separately paged. |
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عبارات ومصطلحات مألوفة
aperture Appearance Astronomer Royal B-0 Approx B-0 Corr Catalogue Comet comparison stars computed Corona Corr correction Cygni d h m dark lines December deduced determination diameter disc distance eclipse Ephemeris equation equatoreal error Evection exposure faint Father Perry Greenwich Mean H-B H-O Hansen's Tables heliometer Iapetus II'I inches instrument July June Jupiter latitude Libration Lick Observatory limb Long Longitude magnitude mean measures meridian Meteorological Meteors mirror Monthly Notices Moon Moon's Nautical Almanac nebula Nights of Observation obtained occultation orbit parallax Paris Perseids photographs places planet plate polar position Professor proper motion Radiant refraction right ascension Royal Observatory satellites Saturn Sept sidereal Slow Slowish solar spectra spectroscope Spectrum bright Spectrum with dark spot Star-line seen Sun-spots Swift taken telescope Tethys tion Transit Circle values wedge ΙΟ Ο Ο
مقاطع مشهورة
الصفحة 159 - Rue's mechanism, which has afforded very admirable results in the production of specula 1 3 inches in aperture and 10 feet focal length, the perfection of which is enhanced by his practice of bestowing the same care and precision on every step of the figuring of the speculum, from, the grinding, the smoothing on a bed of hones, or rather a slab of slate cut into squares, carefully brought to the same figure, and to the figuring of the polisher itself, which being thus previously rendered almost perfect,...
الصفحة 161 - ... fixed) to get the other. Nothing can surpass the impression of real corporeal form thus conveyed by some of these pictures as taken by Mr. De la Rue with his powerful reflector, the production of which (as a step in some sort taken by man outside of the planet he inhabits) is one of the most remarkable and unexpected triumphs of scientific art.
الصفحة 374 - A Mechanical Theory of the Solar Corona." It stated that his investigations seemed to prove conclusively that the solar corona is caused by light emitted and reflected from streams of matter ejected from the sun by forces which in general act along lines normal to the surface of the sun ; these forces are most active near the center of each sun-spot zone. Owing to the...
الصفحة 148 - THE SOUTHERN SKIES : a Plain and Easy Guide to the Constellations of the Southern Hemisphere. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With an Introduction and a separate Explanation of each Map. True for every Year.
الصفحة 250 - The reduction of the latitudes of the spots is not yet completed. The result of these observations may be thus briefly stated. As we pass from minimum to maximum, the lines of the chemical elements gradually disappear from among those most widened, their places being taken by lines of which at present we have no terrestrial representatives. Or, to put the result another way — at the minimum period of sunspots when we know the solar atmosphere is quietest and coolest, vapours containing the lines...
الصفحة 157 - XXVI. p. 1* WARREN DE LA RUE was born at Guernsey on January 18th, 1815, and was the son of Mr. Thomas de la Rue, the founder of the eminent firm of manufacturing stationers in London. He was educated at the College Saint-Barbe in Paris, where he remained until he returned to London to enter his father-s business. He subsequently succeeded his father as head of the firm, from which he retired in 1880. In the course of his conduct of the firm Mr. de la Rue applied his scientific knowledge to purposes...
الصفحة 254 - Spörer's case was taken up by Walter Maunder, superintendent of the Solar Department of the Royal Observatory Greenwich. In 1890 he reported to the Royal Astronomical Society—"For a period of about seventy years, ending in 1716, there seems to have been a remarkable interruption of the ordinary course of the spot cycle. In several years no spots appear to have been seen at all, and in 1705 it was recorded as a most remarkable event that two spots were seen on the Sun at the same time, for a similar...
الصفحة 161 - Sccchi, has been pointed out by Mr. De la Rue, namely, that those portions of the moon's surface which are illuminated by a very oblique ray from the sun possess so little photogenic power that, although to the eye they appear as bright as other portions of the moon illuminated by a more direct ray, the latter will produce the effect called by photographers solarisation...
الصفحة 312 - I have observed in my comet seeking a most remarkable small inky black hole in a crowded part of the Milky Way.
الصفحة 166 - Commander of the Legion of Honour, Commander of the Order of St. Maurice and St. Lazarus, Knight of the Order of the Rose, Brazil ; is son of the late Mr.