Celestial Objects for Common TelescopesLongmans, Green, 1873 - 343 páginas |
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... object is once discovered by a superior power , an inferior one will suffice to see it afterwards SIR W. HERSCHEL Inertia mors est philosophiæ - vivamus nos et exerceamur KEPLER A To o the Memory of THE LATE VICE - ADMIRAL.
... object is once discovered by a superior power , an inferior one will suffice to see it afterwards SIR W. HERSCHEL Inertia mors est philosophiæ - vivamus nos et exerceamur KEPLER A To o the Memory of THE LATE VICE - ADMIRAL.
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... 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 , the reader will have to excuse a condensed mode of expression , the result of ...
... 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 , the reader will have to excuse a condensed mode of expression , the result of ...
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... object ; the diameter of the object - glass in achromatics , or the large speculum in reflectors , exclusive of its setting . + Maskelyne estimated the apertures of reflectors and achromatics of equal brightness as 8 to 5. Dawes gives ...
... object ; the diameter of the object - glass in achromatics , or the large speculum in reflectors , exclusive of its setting . + Maskelyne estimated the apertures of reflectors and achromatics of equal brightness as 8 to 5. Dawes gives ...
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... object - glass of about 14 inches focus , and 1 inch aper- ture : this , with an astronomical eye - piece , will shew the existence of the solar spots , the mountains in the Moon , Jupiter's satellites , and Saturn's ring . Achromatics ...
... object - glass of about 14 inches focus , and 1 inch aper- ture : this , with an astronomical eye - piece , will shew the existence of the solar spots , the mountains in the Moon , Jupiter's satellites , and Saturn's ring . Achromatics ...
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... object - glass or speculum ; they merely obstruct a very little light . Actual performance is the only adequate test . The image should be neat and well defined with the highest power , and should come in and out of focus sharply ; that ...
... object - glass or speculum ; they merely obstruct a very little light . Actual performance is the only adequate test . The image should be neat and well defined with the highest power , and should come in and out of focus sharply ; that ...
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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.