Monthly Notices of the Royal Astronomical Society, Volume 28Priestley and Weale, 1868 Includes lists of additions to the Society's library, usually separately paged. |
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Common terms and phrases
achromatic angle aperture appearance Argelander Argûs Bessel Binary Stars bisection black drop calculated Catalogue centre Cephei 51 circle cloud colatitude colour Comet correction Cygni dark Dawes Decl determined discordances distance ditto double stars Earth egress Epoch equations Equatoreal formula give Greenwich Herschel horizon Huggins inches ingress instrument internal contact John Herschel Lalande last cont latitude light limb longitude Lunar Crater Linné lunar eclipse magnitude March mean Memoirs meridian meteors micrometer Minor Planet Monthly Notices Moon Moon's motion Nebula Nutation object object-glass Observatory obtained occultation orbit Orionis parallax penumbra planet Polaris position probable error Prof proper motion Ptolemy radiant point reappearance reduced refraction Right Ascension satellite seen shadow Solar Eclipse spectrum stars Sun's T. W. Webb tion transit Ursa Minoris Venus visible W. R. Dawes Zenith Telescope ΙΟ
Popular passages
Page 260 - ... precisely of the times that the internal contacts of the body of Venus happened, by reason of the darkness of the penumbra at the Sun's limb, it being there nearly, if not quite, as dark as the planet.
Page 88 - With a powerful spectroscope the light reflected from our atmosphere near the sun's limb edge would be greatly reduced in intensity by the dispersion of the prisms, while the bright lines of the prominences, if such be present, would remain but little diminished in brilliancy. This principle has been carried out by various forms of prismatic apparatus, and also by other contrivances, but hitherto without success.
Page 243 - I saw a line in the green near F, but I had lost so much time in finding the protuberance (owing to the finder having changed its adjustment since last night) that I lost it in the sunlight before measuring it, and I believe I saw traces of a line in the blue near G, but to see them clearly involves a very large change in the focus of the telescope, which was out of the question then. I conclude that my result is that the atmosphere of the sun is mainly of non-luminous, or faintly luminous, gas at...
Page 260 - Fig. 5 (not given) is a representation of the appearance of Venus at the middle of the egress and ingress, for the very same phenomenon was observed at both : at the total ingress, the thread of light made its appearance with an uncertainty of several seconds ; I judged that the penumbra was in contact with the Sun's limb 10...
Page 269 - ... for the calculation of the geocentric and heliocentric places, for the determination of the orbits of Planets and Comets, for the correction of approximate elements, and for the computation of special perturbation ; together with the theory of the combination of observations, and the method of least squares.
Page 201 - In the twilight it appears as soon as a star of the second or third magnitude, the light being white and more diffuse, very like a small white woolly cloud on a blue sky, seen in Sunlight.
Page 204 - Hall, in Essex, who, about 1729, as appears by his papers, considering the different humours of the eye, imagined they were placed so as to correct the different refrangibility of light. He then conceived that if he could find substances having such properties as he supposed these humours might possess, he should be enabled to construct an object-glass that would show objects colourless. After many experiments he had the good fortune to find these properties in two different sorts of glass; and by...
Page 66 - ... is, omitting binary stars, and those whose components are of equal magnitude), the directions of apparent change of position are favourable to the supposition of a measurable parallax. This is particularly the case with respect to 32 Eridani and Herschel 95, which the author in conclusion recommends to the notice of astronomers provided with adequate instruments for observing them. 2. " Magnetic Survey of the Eastern Archipelago.
Page 203 - This might perhaps be said with some degree of justice, as Mr. Hall was a gentleman of property, and did not look to any pecuniary advantage at the time from his discovery.
Page 205 - Mansfield observed that * it was not the person who locked up his invention in his scrutoire that ought to profit by a patent for such invention, but he who brought it forth for the benefit of the public.