Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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Página 23
... nucleus ' by the older observers , often very irregular in its outline , * which resembles , as Secchi remarks , the creeping of a very dense luminous mate- rial over an extremely rough surface ; and a surrounding ' penumbra ' ( the ...
... nucleus ' by the older observers , often very irregular in its outline , * which resembles , as Secchi remarks , the creeping of a very dense luminous mate- rial over an extremely rough surface ; and a surrounding ' penumbra ' ( the ...
Página 24
... nucleus , ' and the presence of which , he believed , might point out an important difference in the origin of the spots . Secchi , who concurs in this discovery , finds that holes in a glazed visiting - card ( which may be burnt with a ...
... nucleus , ' and the presence of which , he believed , might point out an important difference in the origin of the spots . Secchi , who concurs in this discovery , finds that holes in a glazed visiting - card ( which may be burnt with a ...
Página 25
... nucleus . The penumbra , which in most cases en- compasses considerable umbræ , occasionally comprises a group of them , and frequently outlasts them , is made up , according to Schwabe , of a multitude of black dots usually radiating ...
... nucleus . The penumbra , which in most cases en- compasses considerable umbræ , occasionally comprises a group of them , and frequently outlasts them , is made up , according to Schwabe , of a multitude of black dots usually radiating ...
Página 27
... nucleus . This view rests on the per- spective appearance of the penumbra , when near the limb , * Schröter used this very appropriate and now universally - admitted term as far back as 1792 . which usually * is more contracted on the ...
... nucleus . This view rests on the per- spective appearance of the penumbra , when near the limb , * Schröter used this very appropriate and now universally - admitted term as far back as 1792 . which usually * is more contracted on the ...
Página 28
... nuclei , one rotating through 100 ° in 64 , the other through 70 ° in 24h . Secchi has also perceived , besides several cases of rotation , a spiral or whirlwind form in the penumbræ and nuclei of certain spots . Something of the kind ...
... nuclei , one rotating through 100 ° in 64 , the other through 70 ° in 24h . Secchi has also perceived , besides several cases of rotation , a spiral or whirlwind form in the penumbræ and nuclei of certain spots . Something of the kind ...
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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.