Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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... Double Stars and Nebula , and its extension , for the use of amateur observers in our colonies , to the whole of the Southern heavens . The omis- sion of position - angles has also been supplied . A compara- tive table of star ...
... Double Stars and Nebula , and its extension , for the use of amateur observers in our colonies , to the whole of the Southern heavens . The omis- sion of position - angles has also been supplied . A compara- tive table of star ...
Página 3
... stars have too much glare ; Jupiter or Saturn are far better ; a close double star is best of all for an experienced eye ; but for general purposes a moderate sized star will suffice ; its image , in focus , with the highest power ...
... stars have too much glare ; Jupiter or Saturn are far better ; a close double star is best of all for an experienced eye ; but for general purposes a moderate sized star will suffice ; its image , in focus , with the highest power ...
Página 5
... double stars . A greater number of eye - pieces admits , how- and * It is erect in the Galilean eye - piece and the Gregorian reflector . But the use of the former is almost confined to opera - glasses , as its field with high powers is ...
... double stars . A greater number of eye - pieces admits , how- and * It is erect in the Galilean eye - piece and the Gregorian reflector . But the use of the former is almost confined to opera - glasses , as its field with high powers is ...
Página 7
... double stars at o " 456 of distance between their centres . This value practically concurs with those given by Dallmeyer and Alvan Clark . Reflectors some- what surpass achromatics in this respect , as theoretically they ought to do but ...
... double stars at o " 456 of distance between their centres . This value practically concurs with those given by Dallmeyer and Alvan Clark . Reflectors some- what surpass achromatics in this respect , as theoretically they ought to do but ...
Página 16
... double stars , from its blurred or tremulous definition ; it will serve , however , for grand general views of bright groups or rich fields , or for irresolvable nebulć , which have no outlines to be deranged : a hazy or foggy night ...
... double stars , from its blurred or tremulous definition ; it will serve , however , for grand general views of bright groups or rich fields , or for irresolvable nebulć , which have no outlines to be deranged : a hazy or foggy night ...
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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 nebulć 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.