Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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Página 24
... perceived the nuclei without any such assistance , and Buffham has seen them frequently with a 2 in . object - glass ; often multiple ; once ( 1870 , June 20 ) 5 in a single umbra . The feeble illumination of the umbra , Dawes ascribed ...
... perceived the nuclei without any such assistance , and Buffham has seen them frequently with a 2 in . object - glass ; often multiple ; once ( 1870 , June 20 ) 5 in a single umbra . The feeble illumination of the umbra , Dawes ascribed ...
Página 28
... perceived , besides several cases of rotation , a spiral or whirlwind form in the penumbræ and nuclei of certain spots . Something of the kind has likewise been twice delineated by Birt , and noticed by several other observers ; * De La ...
... perceived , besides several cases of rotation , a spiral or whirlwind form in the penumbræ and nuclei of certain spots . Something of the kind has likewise been twice delineated by Birt , and noticed by several other observers ; * De La ...
Página 37
... perceived when the image is cast on paper , and its effect is evident in the Kew , and especially the Rutherfurd photo- graphs . By means of a doubly refracting prism , Secchi has found the limb not more luminous than the penumbræ of ...
... perceived when the image is cast on paper , and its effect is evident in the Kew , and especially the Rutherfurd photo- graphs . By means of a doubly refracting prism , Secchi has found the limb not more luminous than the penumbræ of ...
Página 45
... perceived two spots again . No ter- restrial analogy will explain a luminosity thus visible close to the splendour of the Sun ; and it seems natural to refer it to the exhausted state of the retina : an artificial disc MERCURY . 45 .
... perceived two spots again . No ter- restrial analogy will explain a luminosity thus visible close to the splendour of the Sun ; and it seems natural to refer it to the exhausted state of the retina : an artificial disc MERCURY . 45 .
Página 48
... when no one else could perceive it . Dawes considers that , with due precaution , Venus might be seen in her upper conjunction within 1 ' of the Sun's limb . At other seasons , a little hand telescope with a 48 THE SOLAR SYSTEM .
... when no one else could perceive it . Dawes considers that , with due precaution , Venus might be seen in her upper conjunction within 1 ' of the Sun's limb . At other seasons , a little hand telescope with a 48 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.