Observational astronomy and guide to the use of the telescope, by a clergyman, ed. by J.T. Slugg |
Other editions - View all
Observational Astronomy and Guide to the Use of the Telescope, by a ... Observational Astronomy No preview available - 2018 |
Observational Astronomy and Guide to the Use of the Telescope, by a ... Observational Astronomy No preview available - 2015 |
Observational Astronomy And Guide To The Use Of The Telescope, By A ... Observational Astronomy No preview available - 2023 |
Common terms and phrases
61 Cygni Admiral Smyth Andromeda Antares aperture Aquila astronomers beautiful double star binary star bright star Canes Venatici Canis Minor Cassiopeia Castor Catalogue celestial objects centre close double star colour Coma Berenices comet companion constellation Cor Caroli dark delicate double star difficult object distant double star double star-pale dup dup easily found equinoctial faint field globe globular grey heavens inches Leonis light lilac Lord Rosse low power Lyra magnitude star meridian Messier naked eye northern horizon object-glass observational astronomy Ophiuchus optical power orange pale blue pale white Perseus PISCES Plate Pleiades pointers Pole Star Pollux position principal star Procyon purple Regulus resembling resolved Right Ascension seen Sirius small constellation small telescope Spica spiral splendid star cluster star-pale yellow star-white TAURUS terrestrial eyepiece triple star Ursa Major Vega Virginis Virgo visible white and pale yellow and blue yellow and pale
Popular passages
Page 24 - I have detected no less than thirty-one nebulae all distinctly visible upon a fine blue sky. Their situation and shape, as well as condition, seem to denote the greatest variety imaginable. In another stratum, or perhaps a different branch of the former, I have...
Page 67 - ... we could plainly see that all about the trapezium is a mass of stars ; the rest of the nebula also abounding with stars and exhibiting the characteristics of resolvability strongly marked.
Page 24 - ... resembling an electric brush issuing from a lucid point ; others of the cometic shape, with a seeming nucleus in the centre, or like cloudy stars, surrounded with a nebulous atmosphere : a different sort again, contain a nebulosity of the milky kind, like that wonderful inexplicable phenomenon about Orionis ; while others shine with a fainter mottled kind of light, which denotes their being resolvable into stars.
Page 72 - Canst thou bind the sweet influences of the Pleiades, Or loose the bands of Orion? Canst thou bring forth Mazzaroth in his season? Or canst thou guide Arcturus with his sons?
Page 23 - Way, and clustering groups sufficiently insulated and condensed to come under the designation of irregular, and in some cases pretty rich clusters. But besides those, there are also nebulae in abundance, both regular and irregular; globular clusters in every state of condensation; and objects of a nebulous character quite peculiar, and which have no analogue in any other region of the heavens.
Page 27 - No one that owns even the commonest kind of a telescope can afford to do without it "Many things, deemed invisible to secondary instruments, are plain enough to one who
Page 23 - When examined through powerful telescopes, the constitution of the nubeculae is found to be of astonishing complexity. The general ground of both consists of large tracts and patches of nebulosity in every stage of resolution, from light irresolvable with 18 inches of reflecting aperture, up to perfectly separated stars like the milky way, and clustering groups sufficiently insulated and condensed to come under the designation of irregular, and in some cases pretty rich clusters. But besides...
Page 27 - outstanding " or uncorrected colour results from the want of a perfect balance between the optical properties of the two kinds of glass of which the object-glass is constructed: it cannot be remedied, but it ought not to be obtrusive. In the best instruments it forms a fringe of violet, purple, or blue, round luminous objects in focus under high powers, especially Venus in a dark sky.
Page 24 - ... or bright dashes ; some of the shape of a fan, resembling an electric brush issuing from a lucid point; others of the cometic shape, with a seeming nucleus in the centre, or like cloudy stars, surrounded with a nebulous atmosphere...
Page 19 - COLOURS OF THE DOUBLE STARS. OLD Zahn, in the strange work called the ' Syntagma,' says of the stars that they shine ' more like torches burning with eternal flame before the altar of the Most High, than the lamps of the ethereal vault, or the funeral lights of the setting sun.' And he proceeds to discuss the various colours seen among the stars, arguing that the stars show by their tint to which planetary party they belong. There are the partisans of Saturn, with a dull and leaden aspect ; the Jovial...