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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accepted accurate ancient appear astronomers attraction bodies bright calculations called catalogue cause centre century Chinese circle comet compared complete Copernicus determined diameter direction discovered discovery distance earth eclipse effect elements enabled epicycles equal error explain fact fixed follow force four Galileo gave give given gravitation heavens held Herschel increased interesting Jupiter Kepler knowledge known later LIBRARIES light lunar Mars mass mathematical mean measured method miles moon moon's motion move Newton noticed object observations Observatory opposition orbit original parallax pass period photographic physical planet planetary pole position predicted progress proper motion proved records researches revolve ring rotation round Royal satellites seems seen showed SIGILLUM solar system spectroscope spectrum stars studied sun's supposed surface tables telescope theory tion trace true Tycho Brahe UNIVERSITY VERITAS