History of Astronomy |
From inside the book
Results 1-5 of 16
Page 35
... bright- The telescope not having been invented , he could . not use a telescopic - sight as we now do in gunnery . This not only removes the difficulty of focussing , but makes the minimum visible angle smaller . Helmholtz has defined ...
... bright- The telescope not having been invented , he could . not use a telescopic - sight as we now do in gunnery . This not only removes the difficulty of focussing , but makes the minimum visible angle smaller . Helmholtz has defined ...
Page 90
... bright lines . If sodium or common salt be thrown on the colourless flame of a spirit lamp , it gives it a yellow colour , and its spectrum is a bright yellow line agreeing in position with line D of the solar spectrum . 1 R. S. Phil ...
... bright lines . If sodium or common salt be thrown on the colourless flame of a spirit lamp , it gives it a yellow colour , and its spectrum is a bright yellow line agreeing in position with line D of the solar spectrum . 1 R. S. Phil ...
Page 95
... bright areas , which are seen all over the sun's surface , but specially in. As Photographed at the Royal Observatory , Greenwich , showing sun - spots with umbræ , penumbræ , and faculæ . SOLAR ECLIPSE , 1882 . THE PHYSICAL PERIOD 95.
... bright areas , which are seen all over the sun's surface , but specially in. As Photographed at the Royal Observatory , Greenwich , showing sun - spots with umbræ , penumbræ , and faculæ . SOLAR ECLIPSE , 1882 . THE PHYSICAL PERIOD 95.
Page 101
... bright lines of 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 ...
... bright lines of 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 ...
Page 105
... bright line spectrum , indicating the presence of 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 ...
... bright line spectrum , indicating the presence of 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 ...
Other editions - View all
Common terms and phrases
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