Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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Página 3
... motion on either side of it . A proper test - object must be chosen ; the Moon is too easy ; Venus too severe except for first - rate glasses ; large stars have too much glare ; Jupiter or Saturn are far better ; a close double star is ...
... motion on either side of it . A proper test - object must be chosen ; the Moon is too easy ; Venus too severe except for first - rate glasses ; large stars have too much glare ; Jupiter or Saturn are far better ; a close double star is ...
Página 5
... motion in following the object . The lateral vision in the Newtonian reflector interposes another difficulty , easily mastered , however , by practice ; the true position of the object being always known from the direction of its motion ...
... motion in following the object . The lateral vision in the Newtonian reflector interposes another difficulty , easily mastered , however , by practice ; the true position of the object being always known from the direction of its motion ...
Página 8
... motion , is simple and manageable : the equatorial form , which makes the telescope revolve on an axis parallel to that of the earth , has some great advantages , in following the object by a single motion , and where the expense of ...
... motion , is simple and manageable : the equatorial form , which makes the telescope revolve on an axis parallel to that of the earth , has some great advantages , in following the object by a single motion , and where the expense of ...
Página 15
... motion of the image ( in reality , the magnified motion of the earth ) , and the exaggeration of every defect in the telescope , the stand , and the atmosphere , that the student will soon learn to reserve it for special objects and for ...
... motion of the image ( in reality , the magnified motion of the earth ) , and the exaggeration of every defect in the telescope , the stand , and the atmosphere , that the student will soon learn to reserve it for special objects and for ...
Página 32
... and more isolated ones very persistent . So Herschel II . , Outlines of Astronomy , § 390. But in the next paragraph they stand as July 12 and Dec. 11 . motion , which is now an established fact . Fritsch 32 THE SOLAR SYSTEM .
... and more isolated ones very persistent . So Herschel II . , Outlines of Astronomy , § 390. But in the next paragraph they stand as July 12 and Dec. 11 . motion , which is now an established fact . Fritsch 32 THE SOLAR SYSTEM .
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Términos y frases comunes
achr achromatic aperture Aquil astronomers atmosphere beautiful Binary bluish Boöt bright brighter brilliant Buffham Cassini centre Ceph Clusters colour comet constellation craters curious dark Dawes deep diameter disc Double Stars Drac dusky Earth eye-piece faint field flushed white globe greenish grey Herc Herschel Huggins interior Jupiter larger Lassell libration light lilac limb luminous lunar minute stars Moon motion naked eye nearly nebulæ noticed nucleus object object-glass observers orange pair pale blue pale white pale yellow photosphere Pisc planet proper motion Red Star reflector region remarkable Right Ascension ring ruddy satellites Schm Schr Schröter Schwabe Secchi seen shadow shew side silvery white smaller smalt solar sometimes spec spots streaks surface Taur telescope topaz Triple Virg visible xIxh xvih XVIII yellowish
Pasajes populares
Página 345 - A NEW STAR ATLAS, for the Library, the School, and the Observatory, in Twelve Circular Maps (with Two Index Plates). Intended as a Companion to ' Webb's Celestial Objects for Common Telescopes.
Página 46 - Fairest of stars, last in the train of night, If better thou belong not to the dawn, Sure pledge of day, that crown'st the smiling morn With thy bright circlet, praise Him in thy sphere, While day arises, that sweet hour of prime.
Página 182 - Lift up your eyes on high, and behold who hath created these things, that bringeth out their host by number; he calleth them all by names by the greatness of his might, for that he is strong in power; not one faileth.
Página 345 - Why didn't somebody teach me the constellations, too, and make me at home in the starry heavens which are always overhead, and which I don't half know to this day?
Página 30 - I have said, he spent to satisfy himself; six more years to satisfy, and still thirteen more to convince, mankind. For thirty years never has the Sun exhibited his disc above the horizon of Dessau without being confronted by Schwabe's imperturbable telescope, and that appears to have happened, on an average, about 300 days a year.
Página 65 - Webb makes the following remarks on the rills:—"These most singular furrows pass chiefly through levels, intersect craters (proving a more recent date), reappear beyond obstructing mountains, as though carried through by a tunnel, and commence and terminate with little reference to any conspicuous feature of the neighbourhood.