History of Astronomy |
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Page 92
... hydrogen , we may see all the lines , and be sure that there is hydrogen in the star ; yet the lines in the star - spectrum may be all slightly displaced to one side of the lines of the comparison spectrum . towards the violet end , it ...
... hydrogen , we may see all the lines , and be sure that there is hydrogen in the star ; yet the lines in the star - spectrum may be all slightly displaced to one side of the lines of the comparison spectrum . towards the violet end , it ...
Page 101
... hydrogen or of calcium , by means of the " Spectroheliograph . " The spectro- scope is placed with its slit in the focus of an equatoreal telescope , pointed to the sun , so that the circular image " The Sun as Photographed on the K ...
... hydrogen or of calcium , by means of the " Spectroheliograph . " The spectro- scope is placed with its slit in the focus of an equatoreal telescope , pointed to the sun , so that the circular image " The Sun as Photographed on the K ...
Page 102
... hydrogen line H ( ) - we obtain two photographs , one showing the appearance of the calcium floculi , and the other of the hydrogen floculi , on the same part of the solar surface ; and nothing is more astonishing than to note the total ...
... hydrogen line H ( ) - we obtain two photographs , one showing the appearance of the calcium floculi , and the other of the hydrogen floculi , on the same part of the solar surface ; and nothing is more astonishing than to note the total ...
Page 105
... hydrogen and other gases . So bright was it that Jansen exclaimed : " Je verrai ces lignes - là en dehors des éclipses . " And the next day he observed the lines at the edge of the uneclipsed sun . Huggins had suggested this observation ...
... hydrogen and other gases . So bright was it that Jansen exclaimed : " Je verrai ces lignes - là en dehors des éclipses . " And the next day he observed the lines at the edge of the uneclipsed sun . Huggins had suggested this observation ...
Page 106
... hydrogen , and helium ; that of the former including a number of metals . The D line of sodium is a double line , and in the same eclipse ( 1868 ) an orange line was noticed which was afterwards found to lie close to the two components ...
... hydrogen , and helium ; that of the former including a number of metals . The D line of sodium is a double line , and in the same eclipse ( 1868 ) an orange line was noticed which was afterwards found to lie close to the two components ...
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accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith