History of Astronomy |
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Page 90
... spectra ; gases , except under enormous pressure , give 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 ...
... spectra ; gases , except under enormous pressure , give 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 ...
Page 91
... spectra had long been known , by transmission through , or reflection from , a The experiment had been made before by one who did not understand its meaning . But Sir George G. Stokes had already given verbally the true explanation of ...
... spectra had long been known , by transmission through , or reflection from , a The experiment had been made before by one who did not understand its meaning . But Sir George G. Stokes had already given verbally the true explanation of ...
Page 92
... spectra of the sun's East ( approaching ) limb and West ( receding ) limb , and the displacement of lines endorsed the theory . last observation was suggested by Zöllner . This 1 Abh . d . Kön . Böhm . d . Wiss . , Bd . ii . , 1841-42 ...
... spectra of the sun's East ( approaching ) limb and West ( receding ) limb , and the displacement of lines endorsed the theory . last observation was suggested by Zöllner . This 1 Abh . d . Kön . Böhm . d . Wiss . , Bd . ii . , 1841-42 ...
Page 102
... spectrum . But Rowland , of Baltimore , after having perfected the art of making true gratings with equidistant lines ruled on metal for producing spectra , then proceeded to make a map of the solar spectrum on a 102 THE PHYSICAL PERIOD.
... spectrum . But Rowland , of Baltimore , after having perfected the art of making true gratings with equidistant lines ruled on metal for producing spectra , then proceeded to make a map of the solar spectrum on a 102 THE PHYSICAL PERIOD.
Page 118
... spectra agreeing together . Sometimes Uranus shows Frauenhofer lines , indicating reflected solar light . But generally these are not seen , and six broad bands of absorption appear . One is the F. of hydrogen ; another is the red ...
... spectra agreeing together . Sometimes Uranus shows Frauenhofer lines , indicating reflected solar light . But generally these are not seen , and six broad bands of absorption appear . One is the F. of hydrogen ; another is the red ...
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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