Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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... larger bulk : but it would thus , in some measure , have de- feated its own object . In order therefore to reduce the size of the volume , without omitting such details as may seem to be required by the present state of Astro- nomy ...
... larger bulk : but it would thus , in some measure , have de- feated its own object . In order therefore to reduce the size of the volume , without omitting such details as may seem to be required by the present state of Astro- nomy ...
Página 1
... larger diameter , but in consequence of the loss of light in reflection , not greater brightness . The original observations in the following pages * ' Aperture ' always means the clear space which receives the light of the object ; the ...
... larger diameter , but in consequence of the loss of light in reflection , not greater brightness . The original observations in the following pages * ' Aperture ' always means the clear space which receives the light of the object ; the ...
Página 2
... larger dimensions have become much less expensive than formerly , and silvered specula of considerable size are now compara- tively common ; even for these it is hoped that this treatise , embodying some of the results of the finest ...
... larger dimensions have become much less expensive than formerly , and silvered specula of considerable size are now compara- tively common ; even for these it is hoped that this treatise , embodying some of the results of the finest ...
Página 15
... larger . In viewing Jupiter in opposition with a power of only 100 , they will not believe that he appears between two and three times as large as the moon to the naked eye ; yet it is demonstrably so . There may be various causes for ...
... larger . In viewing Jupiter in opposition with a power of only 100 , they will not believe that he appears between two and three times as large as the moon to the naked eye ; yet it is demonstrably so . There may be various causes for ...
Página 21
... larger sur- face it will require to be worked very true . To bring the Sun into the field , do not attempt to look for it with the finder unless it has a solar cap : point the tele- scope till the finder shows it centrally on the hand ...
... larger sur- face it will require to be worked very true . To bring the Sun into the field , do not attempt to look for it with the finder unless it has a solar cap : point the tele- scope till the finder shows it centrally on the hand ...
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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.